Nutritional Values of Indian Thalis Across 29 States Compared to Recommended Dietary Allowances (RDAs)

1. Introduction to Indian Thalis and Nutritional Significance

1.1. Overview of Indian Thalis and Regional Variations

Indian thalis represent a captivating mosaic of regional cuisines, each a testament to the country's diverse culinary heritage [1]. These platters are not merely meals; they are carefully curated selections of dishes designed to offer a complete and balanced nutritional experience. The composition of a thali varies dramatically from state to state, reflecting the unique ingredients, cooking styles, and dietary preferences prevalent in each region. These variations are not arbitrary; they are deeply rooted in the local agricultural practices, climatic conditions, and cultural traditions that have shaped the culinary landscape of India over centuries [1].

The concept of a thali itself is a reflection of the Indian philosophy of food, which emphasizes balance and harmony. A traditional thali typically includes a variety of dishes, such as dal (lentils), vegetables, rice or roti (flatbread), yogurt or curd, and a sweet dish, each contributing different nutrients to the overall meal. The specific ingredients and preparations, however, differ significantly depending on the region. For example, a thali from Rajasthan might feature dishes like dal baati churma (lentil and wheat dumplings with a sweet crumble) and gatte ki sabzi (gram flour dumplings in yogurt-based gravy), reflecting the arid climate and the availability of specific ingredients in the region. In contrast, a thali from Kerala might include rice, sambar (lentil-based vegetable stew), avial (mixed vegetable dish with coconut), and fish curry, showcasing the abundance of rice, coconut, and seafood in the coastal state.

Understanding these regional variations is crucial for gaining a comprehensive understanding of the overall nutritional landscape of India [2]. It allows us to appreciate the nutritional strengths and weaknesses of different dietary patterns and to identify potential areas for improvement. By analyzing the composition of thalis from different states, we can gain insights into the dietary habits of various populations and develop targeted interventions to address specific nutritional deficiencies or excesses. Furthermore, the native germplasm resources, adapted to specific ecological niches, play a vital role in contributing to the nutritional diversity observed across these regional thalis [1]. These indigenous varieties of grains, pulses, vegetables, and fruits often possess unique nutritional properties that are not found in commercially cultivated crops, adding another layer of complexity and richness to the Indian culinary tradition.

1.2. Importance of Nutritional Adequacy in the Indian Context

Addressing malnutrition remains a formidable challenge in India, a nation grappling with a complex interplay of socioeconomic factors, dietary habits, and public health infrastructure [3]. Despite significant progress in recent decades, deficiencies in essential micronutrients, such as iron, zinc, and vitamin A, continue to be widespread, particularly among vulnerable populations like women and children. These deficiencies have far-reaching consequences, impairing cognitive development, weakening immune function, and increasing the risk of chronic diseases. The prevalence of anemia, primarily caused by iron deficiency, is a major public health concern, affecting a significant proportion of women of reproductive age and contributing to maternal mortality. Similarly, zinc deficiency can lead to stunted growth, impaired immune function, and increased susceptibility to infections, particularly in young children.

Assessing the nutritional content of Indian thalis, therefore, becomes an essential step in identifying potential gaps and informing strategies for improving dietary intake [4]. By analyzing the macronutrient and micronutrient composition of these traditional meals, we can pinpoint specific areas where deficiencies are likely to occur and develop targeted interventions to address them. For instance, if a particular regional thali is found to be deficient in iron, strategies such as promoting the consumption of iron-rich foods, enhancing iron bioavailability through dietary modifications, or fortifying staple foods with iron can be implemented. Similarly, if a thali is found to be excessive in carbohydrates or saturated fats, interventions aimed at promoting balanced meal planning and healthier cooking practices can be undertaken.

Fortification and dietary diversification stand out as key approaches to combatting micronutrient deficiencies in the Indian context [5]. Food fortification involves adding essential micronutrients to commonly consumed foods, such as salt, wheat flour, or cooking oil, to increase their nutritional value. This strategy has proven to be effective in addressing widespread deficiencies, particularly in populations with limited access to diverse food sources. Dietary diversification, on the other hand, focuses on encouraging the consumption of a wide variety of foods from different food groups to ensure an adequate intake of all essential nutrients. This approach emphasizes the importance of incorporating fruits, vegetables, pulses, legumes, nuts, and animal products into the diet to provide a balanced and complete nutritional profile. Traditional foods often possess unique nutritional profiles that can significantly contribute to overall health and well-being, and promoting their consumption can be an effective way to address nutritional gaps [6].

1.3. Objectives and Scope of the Comparison

This comprehensive analysis aims to compare the nutritional values of thalis from all 29 Indian states, providing a detailed overview of the dietary landscape across the country [4]. The primary focus will be on key macronutrients, including carbohydrates, protein, and fat, as well as essential micronutrients such as calcium, iron, potassium, sodium, and various vitamins. The comparison will be grounded in available data on food composition, dietary surveys, and recommended dietary allowances (RDAs), ensuring a robust and evidence-based assessment [7].

The data sources for this analysis will include the Indian Food Composition Tables (IFCT), which provide detailed information on the nutrient content of various foods commonly consumed in India. Dietary surveys, such as the National Nutrition Monitoring Bureau (NNMB) surveys, will be used to assess the actual dietary intake of different populations across the country. Recommended dietary allowances (RDAs), established by national and international health organizations, will serve as benchmarks for evaluating the adequacy of nutrient intake. The objective is to highlight the nutritional strengths and weaknesses of different regional thalis, identifying opportunities for improvement and informing the development of targeted interventions [4]. By comparing the nutrient content of each thali with the corresponding RDA, we can determine whether the meal provides adequate amounts of essential nutrients or falls short of meeting the recommended levels. This information can then be used to develop strategies for improving the nutritional quality of thalis, such as modifying recipes, promoting the consumption of nutrient-rich foods, or fortifying staple foods with essential micronutrients.

Understanding the nutritional profile of common foods is essential for formulating effective dietary guidelines and promoting healthy eating habits [8]. By providing a detailed analysis of the nutritional content of Indian thalis, this comparison aims to empower individuals, healthcare professionals, and policymakers to make informed decisions about food choices and develop strategies for improving the nutritional well-being of the Indian population. This information can be used to create educational materials, develop targeted interventions, and advocate for policies that promote access to affordable, nutritious foods for all.

2. Carbohydrate Content in Indian Thalis

2.1. Staple Grains and Carbohydrate Sources

Rice, wheat, and millets form the triumvirate of primary carbohydrate sources in Indian thalis, their regional prevalence dictated by a complex interplay of climate, soil conditions, and historical agricultural practices [7]. These grains are not merely sources of energy; they are deeply embedded in the cultural fabric of India, shaping culinary traditions and dietary habits across the country. The choice of staple grain often reflects the environmental conditions of a particular region. Rice, for example, thrives in the humid, fertile plains of eastern and southern India, where abundant rainfall and fertile soil provide ideal growing conditions. Wheat, on the other hand, is more commonly cultivated in the drier, cooler regions of northern and western India, where it is better suited to the climate and soil. Millets, a group of small-seeded grains, are particularly important in arid and semi-arid regions, where they are valued for their drought resistance and ability to grow in marginal soils.

The carbohydrate content of Indian thalis can vary significantly based on several factors, including the type of grain used, the processing methods employed, and the portion sizes consumed [9]. Different grains have different carbohydrate compositions, with varying amounts of starch, fiber, and sugars. Processing methods, such as refining or polishing, can also affect the carbohydrate content and nutritional value of grains. Refining, for example, removes the bran and germ, which are rich in fiber and micronutrients, resulting in a product that is higher in starch but lower in overall nutritional value. Portion sizes, of course, play a crucial role in determining the total carbohydrate intake from a meal. Large servings of rice or roti can significantly increase the carbohydrate load, potentially contributing to weight gain and metabolic disorders.

Understanding the glycemic index (GI) and glycemic load (GL) of these carbohydrate sources is paramount for managing blood sugar levels, particularly in individuals with diabetes or insulin resistance [8]. The glycemic index is a measure of how quickly a food raises blood glucose levels, while the glycemic load takes into account both the GI and the amount of carbohydrate in a serving of food. Foods with a high GI and GL can cause rapid spikes in blood sugar, which can be detrimental to metabolic health. Choosing carbohydrate sources with a lower GI and GL, such as whole grains and millets, can help to maintain stable blood sugar levels and reduce the risk of chronic diseases. Foxtail millet, for example, is a nutri-cereal that contains carbohydrates, proteins, and lipids, offering a more balanced nutritional profile compared to refined grains [3].

2.2. Regional Variations in Carbohydrate Intake

Significant regional variations characterize carbohydrate intake patterns across India, reflecting the diverse dietary habits and culinary traditions of different states [7]. States like West Bengal and Kerala, where rice is deeply ingrained as a staple food, tend to exhibit higher carbohydrate intake compared to states like Punjab, where wheat holds a more prominent position in the diet. This difference in staple grain preference directly influences the overall carbohydrate load of the regional thalis. In rice-consuming regions, meals often revolve around large portions of rice, accompanied by smaller servings of dal, vegetables, and other side dishes. In contrast, wheat-consuming regions typically feature roti or other wheat-based flatbreads as the primary carbohydrate source, with a more balanced proportion of other dishes.

The inclusion of processed foods and sugary drinks further complicates the carbohydrate intake landscape, often leading to excessive consumption and contributing to a range of health problems [2]. Processed foods, such as packaged snacks, instant noodles, and ready-to-eat meals, are often high in refined carbohydrates, added sugars, and unhealthy fats, while sugary drinks, such as sodas, juices, and sweetened beverages, provide empty calories and contribute to weight gain and insulin resistance. The increasing availability and affordability of these processed products have led to a shift away from traditional dietary patterns, with potentially detrimental consequences for public health.

Traditional methods of processing grains, such as fermentation, play a crucial role in affecting the bioavailability of nutrients and the digestibility of carbohydrates, adding another layer of complexity to the carbohydrate intake equation [8]. Fermentation is a traditional food processing technique that involves the use of microorganisms to transform the chemical composition of foods. In the case of grains, fermentation can break down complex carbohydrates into simpler sugars, making them easier to digest. It can also increase the bioavailability of certain nutrients, such as iron and zinc, by reducing the levels of phytates, which are compounds that inhibit nutrient absorption. A study found a negative relationship between the altitude of the sample collection site and available carbohydrate content, suggesting that environmental factors can also influence carbohydrate composition [1].

2.3. Comparison with RDA and Health Implications

The recommended dietary allowance (RDA) for carbohydrates varies based on several factors, including age, sex, and activity level, but generally falls within the range of 130-150 grams per day for adults, according to established guidelines [10]. This recommendation is based on the amount of glucose needed to fuel the brain and central nervous system. However, the actual carbohydrate intake of many individuals in India, particularly those residing in regions with high rice consumption, may significantly exceed this RDA, potentially contributing to a cascade of adverse health consequences, including insulin resistance and weight gain [2].

Excessive carbohydrate intake, especially from refined grains and sugary foods, can lead to a condition known as insulin resistance, where the body's cells become less responsive to the effects of insulin, a hormone that regulates blood sugar levels. This can result in elevated blood sugar levels, which, over time, can damage various organs and tissues, increasing the risk of type 2 diabetes, cardiovascular disease, and other chronic conditions. Furthermore, excessive carbohydrate intake can contribute to weight gain, particularly when combined with a sedentary lifestyle. The body converts excess carbohydrates into fat, which is stored in adipose tissue, leading to an increase in body weight and potentially obesity.

Balancing carbohydrate intake with adequate protein and fiber intake is paramount for maintaining optimal metabolic health and mitigating the risks associated with excessive carbohydrate consumption [8]. Protein helps to promote satiety, reducing overall calorie intake and preventing overconsumption of carbohydrates. Fiber, on the other hand, slows down the absorption of carbohydrates, preventing rapid spikes in blood sugar levels and promoting a feeling of fullness. Incorporating more protein-rich foods, such as pulses, legumes, and dairy products, and fiber-rich foods, such as fruits, vegetables, and whole grains, into the diet can help to create a more balanced and healthful meal. Cereals are a major category meeting values in the case of carbohydrates, approximately fulfilling 100% of the dietary supply, underscoring the importance of choosing whole grains over refined options [7].

3. Protein Content in Indian Thalis

3.1. Primary Protein Sources in Vegetarian and Non-Vegetarian Thalis

Pulses, legumes, dairy products, and nuts serve as the cornerstones of protein intake in vegetarian Indian thalis, while meat, fish, and eggs take precedence in non-vegetarian counterparts [11]. Each of these protein sources boasts a unique amino acid profile, influencing the overall quality of protein intake and its subsequent impact on various physiological functions. Pulses and legumes, such as lentils, chickpeas, and kidney beans, are rich in essential amino acids, but they are often limiting in methionine. Dairy products, such as milk, yogurt, and cheese, provide a complete protein source, containing all the essential amino acids in adequate amounts. Nuts and seeds, such as almonds, walnuts, and sunflower seeds, are also good sources of protein, but they should be consumed in moderation due to their high fat content.

The protein content and amino acid profile can vary significantly among these sources, affecting the overall quality of protein intake and its subsequent impact on various physiological functions [12]. Animal-based protein sources, such as meat, fish, and eggs, generally provide a more complete amino acid profile compared to plant-based sources, meaning they contain all the essential amino acids in adequate amounts. However, animal-based protein sources can also be high in saturated fat and cholesterol, which may increase the risk of cardiovascular disease. Plant-based protein sources, on the other hand, are generally lower in saturated fat and cholesterol and higher in fiber, but they may be limiting in certain essential amino acids.

Combining different protein sources becomes a crucial strategy to ensure a complete amino acid profile, particularly for individuals adhering to vegetarian diets [12]. This practice, known as protein complementation, involves consuming a variety of plant-based protein sources throughout the day to ensure that all essential amino acids are adequately supplied. For example, combining lentils (limiting in methionine) with rice (containing methionine) can provide a complete protein source. Similarly, combining beans (limiting in lysine) with corn (containing lysine) can also achieve protein complementation. Indian mustard genotypes, for example, are known to contain varying levels of protein content, highlighting the diversity within plant-based protein sources [11].

3.2. Regional Differences in Protein Consumption

States with a predominantly vegetarian population, such as Gujarat and Rajasthan, place a significant reliance on plant-based protein sources to meet their daily protein requirements, showcasing the adaptability of culinary traditions to dietary needs [1]. In these regions, pulses and legumes form the cornerstone of protein intake, with dishes like dal, chana masala, and vegetable curries featuring prominently in the daily diet. Dairy products, such as milk, yogurt, and paneer (Indian cheese), also contribute significantly to protein intake, particularly among those who consume dairy. Nuts and seeds, such as almonds, cashews, and sesame seeds, are often incorporated into snacks and desserts, providing an additional source of protein.

Coastal regions like Kerala and West Bengal, blessed with abundant access to seafood, often include fish in their thalis, thereby contributing to a higher overall protein intake compared to their vegetarian counterparts [13]. Fish is an excellent source of high-quality protein, providing all the essential amino acids necessary for human health. It is also rich in omega-3 fatty acids, which have numerous health benefits, including reducing the risk of cardiovascular disease and improving brain function. In these coastal regions, fish curries, fried fish, and other seafood preparations are common features of the daily diet, providing a significant boost to protein intake.

Socioeconomic factors and cultural practices also exert a profound influence on protein consumption patterns across different regions of India, shaping dietary habits and access to diverse protein sources [2]. In general, higher socioeconomic status is associated with increased protein intake, particularly from animal-based sources. This is due to the fact that animal-based protein sources are often more expensive and less accessible to low-income populations. Cultural practices, such as religious beliefs and traditional dietary customs, can also influence protein consumption patterns. For example, some religious groups may abstain from consuming certain types of meat, while others may prioritize vegetarian diets for ethical or environmental reasons. A study found that all the germplasm except Yellow Chamba Local reflected a higher protein content than reported values in IFCT2017 (8.80), suggesting a potential for utilizing diverse germplasm to enhance protein intake [1].

3.3. Adequacy of Protein Intake Compared to RDA

The recommended dietary allowance (RDA) for protein is approximately 0.8 grams per kilogram of body weight per day, serving as a benchmark for assessing the adequacy of protein intake across different populations [10]. However, this recommendation may be higher for certain groups, including children, pregnant women, and athletes, who have increased protein needs to support growth, development, and physical activity. Children, for example, require more protein per kilogram of body weight compared to adults to support their rapid growth and development. Pregnant women also have increased protein needs to support the growth of the fetus and the production of breast milk. Athletes, particularly those engaged in strength training, require more protein to repair and rebuild muscle tissue.

Many Indian thalis, particularly those lacking sufficient pulses or non-vegetarian items, may fall short of meeting the RDA for protein, raising concerns about potential protein deficiencies and their associated health consequences [14]. This is particularly true for individuals following vegetarian diets, who may need to carefully plan their meals to ensure they are consuming enough protein from plant-based sources. Even non-vegetarian thalis may not provide adequate protein if they are heavily reliant on carbohydrates and fats, with only small servings of meat, fish, or eggs.

Improving protein intake is essential for supporting a wide range of physiological functions, including growth, immune function, and overall health, especially among vulnerable populations who are at higher risk of protein deficiency [13]. Protein is crucial for building and repairing tissues, producing enzymes and hormones, and supporting the immune system. Protein deficiency can lead to a variety of health problems, including stunted growth, weakened immune function, muscle wasting, and fatigue. Fish, being a relatively cheap and accessible source of animal protein, can play a significant role in improving protein intake, particularly in rural communities where access to other protein sources may be limited [13].

4. Fat Content and Fatty Acid Composition

4.1. Common Fats and Oils Used in Indian Cooking

Ghee, vegetable oils (such as mustard, groundnut, and sunflower oil), and coconut oil constitute the common fats and oils employed in Indian cooking, each imparting a distinct flavor profile and fatty acid composition that influences the overall healthfulness of the dishes [15]. Ghee, a clarified butter, holds a revered position in Indian cuisine, prized for its rich flavor and aroma. It is commonly used in traditional sweets, curries, and other dishes, particularly in northern India. Vegetable oils, such as mustard oil, groundnut oil, and sunflower oil, are widely used for cooking and frying, offering a more neutral flavor compared to ghee. Coconut oil, prevalent in southern India, adds a distinct tropical flavor to dishes and is often used in curries, stir-fries, and desserts.

The type of fat employed can significantly impact the overall healthfulness of the thali, particularly concerning the balance of saturated and unsaturated fatty acids, which have divergent effects on cardiovascular health [16]. Saturated fats, found in high concentrations in ghee and coconut oil, have been linked to increased levels of LDL cholesterol, a major risk factor for heart disease. Unsaturated fats, on the other hand, found in vegetable oils such as mustard oil, groundnut oil, and sunflower oil, can help to lower LDL cholesterol and raise HDL cholesterol, the "good" cholesterol, thereby reducing the risk of cardiovascular disease.

Traditional cooking methods, such as deep frying, can substantially increase the fat content of foods and alter the fatty acid composition, potentially negating the health benefits of using healthier oils [15]. Deep frying involves submerging foods in hot oil, which can lead to the absorption of large amounts of fat. It can also cause the oxidation of unsaturated fatty acids, forming harmful trans fats, which have been linked to increased risk of heart disease, Three accessions, namely, Malan 11 (7.06%), Malan 24 (7.20%), and Yellow Chamba Local 02 (8.03%) exhibited almost double the crude fat content as compared with the values notified in IFCT2017 (3.77), indicating the potential for variability in fat content even within specific food types [1].

4.2. Regional Variations in Fat Consumption

States in northern India, including Punjab and Haryana, tend to exhibit higher fat consumption patterns, primarily attributed to the generous use of ghee and butter in their culinary preparations [2]. These dairy-rich fats are integral to the flavor and texture of many traditional dishes, contributing significantly to the overall fat content of the regional thalis. Dishes like butter chicken, dal makhani, and various types of parathas (stuffed flatbreads) are typically prepared with liberal amounts of ghee or butter, adding a rich and decadent flavor but also increasing the saturated fat content.

Southern states, particularly those gracing the coastline, often favor coconut oil as their primary cooking medium, a choice that significantly influences the fatty acid profile of their regional cuisine due to coconut oil's high saturated fat content [15]. Coconut oil imparts a distinctive flavor to dishes, making it a staple in curries, stir-fries, and desserts. However, its high saturated fat content raises concerns about its potential impact on cardiovascular health. The increasing consumption of processed foods high in trans fats is a growing concern across all regions, posing a significant threat to public health due to the detrimental effects of trans fats on cardiovascular health [2]. These industrially produced fats are often found in packaged snacks, baked goods, and fried foods, and their consumption has been linked to increased risk of heart disease, stroke, and other chronic conditions. The fat content of the landraces was lower (<0.6g/100g) than popular Indian rice varieties, suggesting a potential for utilizing these landraces to reduce overall fat intake [4].

4.3. Impact on Health and Comparison with Dietary Guidelines

Excessive saturated fat intake has been definitively linked to an increased risk of cardiovascular diseases, primarily through its adverse effects on cholesterol levels and arterial health [17]. Saturated fats can raise LDL cholesterol levels, promoting the formation of plaque in the arteries, which can lead to heart attacks and strokes. Conversely, unsaturated fats, particularly omega-3 fatty acids, have demonstrated beneficial effects on cardiovascular health, including reducing inflammation, lowering blood pressure, and improving cholesterol levels [18].

Dietary guidelines, established by leading health organizations, recommend limiting saturated fat intake to less than 10% of total calories, urging a conscious shift towards increased consumption of unsaturated fats to promote heart health and overall well-being [16]. This recommendation is based on a wealth of scientific evidence demonstrating the detrimental effects of saturated fats and the protective effects of unsaturated fats on cardiovascular health. Many Indian thalis may exceed the recommended saturated fat intake, necessitating a strategic shift towards healthier oil choices and more mindful cooking methods to align with dietary guidelines and mitigate health risks [16]. This shift could involve using vegetable oils rich in unsaturated fats, such as mustard oil, groundnut oil, or sunflower oil, instead of ghee or coconut oil, and reducing the amount of oil used in cooking. The monounsaturated fatty acids (MUFA) were found to be maximum in RH 0749 (58.70 %), followed by RH (OE) 0801 (48.91 %), JM 6011 (47.03 %), EC 597328 and EC 597340 (45.77 %), suggesting that incorporating these varieties into the diet could help increase MUFA intake [11].

5. Calcium Content in Indian Thalis

5.1. Major Dietary Sources of Calcium

Dairy products, green leafy vegetables, and fortified foods constitute the major dietary sources of calcium in Indian diets, each playing a crucial role in meeting the body's calcium requirements and supporting bone health [19]. Dairy products, such as milk, yogurt, and cheese, are excellent sources of calcium, providing a readily absorbable form of this essential mineral. Green leafy vegetables, such as spinach, kale, and mustard greens, also contribute to calcium intake, although the bioavailability of calcium from these sources may be lower due to the presence of phytates and oxalates. Fortified foods, such as milk, yogurt, and breakfast cereals, are often enriched with calcium to increase their nutritional value and help individuals meet their calcium needs.

The bioavailability of calcium can vary significantly based on the presence of phytates and oxalates in plant-based foods, influencing the amount of calcium that the body can actually absorb and utilize [20]. Phytates and oxalates are naturally occurring compounds found in many plant-based foods, including grains, legumes, and vegetables. These compounds can bind to calcium in the digestive tract, forming insoluble complexes that are not easily absorbed by the body. This can reduce the bioavailability of calcium, meaning that less of the mineral is actually available for use by the body.

Traditional practices like soaking and fermenting grains can help improve calcium bioavailability, mitigating the inhibitory effects of phytates and enhancing calcium absorption [8]. Soaking grains in water for several hours before cooking can help to reduce the levels of phytates, increasing the bioavailability of calcium and other minerals. Fermenting grains, such as in the preparation of idli and dosa, can also help to break down phytates, further enhancing calcium absorption. Raisins, for example, are a source of calcium, and incorporating them into the diet can contribute to overall calcium intake [19].

5.2. Regional Variations in Calcium Intake

States with higher dairy consumption, including Punjab and Haryana, tend to exhibit better calcium intake levels compared to regions where dairy consumption is limited, reflecting the impact of dietary habits on nutrient intake [17]. The widespread availability and consumption of dairy products in these states contribute significantly to the overall calcium intake of the population. Milk, yogurt, and paneer are common features of the daily diet, providing a readily absorbable source of calcium.

In regions where dairy consumption is limited, green leafy vegetables and fortified foods assume a crucial role in meeting calcium needs, highlighting the importance of diverse dietary strategies to address nutritional gaps [4]. In these regions, individuals may rely more heavily on plant-based sources of calcium, such as spinach, kale, and mustard greens, to meet their calcium requirements. Fortified foods, such as milk, yogurt, and breakfast cereals, can also play an important role in increasing calcium intake, particularly for those who do not consume dairy products.

Cultural practices and dietary habits significantly influence calcium intake across different regions, shaping food choices and dietary patterns that impact overall nutritional status [2]. For example, some cultural groups may have a tradition of consuming calcium-rich foods, such as sesame seeds or ragi (finger millet), while others may avoid dairy products due to lactose intolerance or other dietary restrictions. These cultural practices and dietary habits can have a significant impact on calcium intake levels and the risk of calcium deficiency. The highest value of calcium was recorded for the American variety and the lowest value in the Iraqi variety of raisins, suggesting that even within a single food type, there can be significant variations in calcium content [19]. Landraces like S1G4, S1G2; and released variety Narasimharaya recorded higher quantities of micronutrient compared to other genotypes studied, indicating the potential for utilizing specific landraces to enhance calcium intake [3].

5.3. Comparison with RDA and Implications for Bone Health

The recommended dietary allowance (RDA) for calcium ranges from 1000-1200 mg per day for adults, with higher requirements for adolescents and older adults to support bone growth and prevent bone loss [10]. Adolescents need more calcium to support their rapid bone growth during puberty, while older adults need more calcium to compensate for age-related bone loss. Meeting the RDA for calcium is essential for maintaining strong bones and preventing osteoporosis, a condition characterized by weak and brittle bones that are prone to fractures.

Many Indian thalis, particularly those lacking sufficient dairy or calcium-rich vegetables, may not meet the RDA for calcium, potentially increasing the risk of osteoporosis and other bone-related disorders, especially among vulnerable populations [21]. This is particularly true for individuals who do not consume dairy products or who have limited access to calcium-rich vegetables. In these cases, it may be necessary to consider calcium supplementation or to focus on increasing the consumption of fortified foods to meet the RDA.

Promoting calcium-rich foods and addressing factors that inhibit calcium absorption are important strategies for improving bone health and reducing the risk of osteoporosis across the Indian population [21]. Encouraging the consumption of dairy products, green leafy vegetables, and fortified foods can help to increase calcium intake. Addressing factors that inhibit calcium absorption, such as high levels of phytates and oxalates in the diet, can also help to improve calcium bioavailability. This can be achieved through traditional practices like soaking and fermenting grains, as well as through dietary modifications such as reducing the consumption of processed foods and increasing the intake of vitamin D, which is essential for calcium absorption.

6. Iron Content in Indian Thalis

6.1. Dietary Sources of Iron and Bioavailability

Green leafy vegetables, pulses, legumes, and fortified foods stand out as important sources of iron in Indian diets, contributing to the body's iron stores and supporting various physiological functions [4]. Green leafy vegetables, such as spinach, fenugreek (methi), and amaranth, are rich in iron, although the bioavailability of iron from these sources may be lower compared to animal-based sources. Pulses and legumes, such as lentils, chickpeas, and kidney beans, also contribute significantly to iron intake, particularly for vegetarians. Fortified foods, such as wheat flour, rice, and salt, are often enriched with iron to increase their nutritional value and help individuals meet their iron needs.

Non-heme iron, the type of iron found in plant-based foods, exhibits lower bioavailability compared to heme iron, which is present in animal sources, impacting the efficiency of iron absorption and utilization by the body [22]. Heme iron is more readily absorbed by the body compared to non-heme iron, as it is not affected by the presence of inhibitors in the diet. Non-heme iron, on the other hand, is more susceptible to the effects of inhibitors, such as phytates, tannins, and oxalates, which can reduce its bioavailability.

Factors like phytates, tannins, and oxalates can further inhibit iron absorption, while vitamin C, a potent enhancer, can significantly improve iron uptake, underscoring the complex interplay of dietary components in influencing iron bioavailability [22]. Phytates, tannins, and oxalates are naturally occurring compounds found in many plant-based foods. These compounds can bind to iron in the digestive tract, forming insoluble complexes that are not easily absorbed by the body. Vitamin C, on the other hand, can enhance iron absorption by converting non-heme iron into a more readily absorbable form. Sathi, Safed Chamba Local, and Ragal Makka had nearly 12% protein content, which might indirectly contribute to improved iron status due to the role of protein in iron metabolism [1].

6.2. Regional Disparities in Iron Intake and Anemia Prevalence

Iron deficiency anemia is a widespread public health problem in India, particularly among women and children, posing a significant threat to their health and well-being [2]. Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin in the blood, resulting in reduced oxygen-carrying capacity. Iron deficiency is the most common cause of anemia, and it can lead to fatigue, weakness, impaired cognitive function, and increased susceptibility to infections.

Regional disparities in iron intake are influenced by a complex interplay of dietary habits, socioeconomic status, and access to healthcare, creating a heterogeneous landscape of iron deficiency across the country [2]. In regions where iron-rich foods are scarce or unaffordable, iron intake may be inadequate, leading to higher rates of anemia. Socioeconomic status also plays a significant role, as low-income populations may have limited access to diverse and nutritious foods, including iron-rich sources. Access to healthcare is also important, as regular checkups and iron supplementation can help to prevent and treat iron deficiency anemia.

States with lower consumption of iron-rich foods and higher rates of parasitic infections tend to exhibit higher anemia prevalence rates, highlighting the synergistic effects of dietary and environmental factors on iron status [2]. Parasitic infections, such as hookworm and malaria, can cause blood loss, leading to iron deficiency anemia. In regions where these infections are prevalent, iron intake may need to be higher to compensate for the blood loss. Mineral malnutrition, mainly due to iron (Fe) deficiency, is a worldwide issue to science, humanity, and society, underscoring the global significance of addressing iron deficiency [1].

6.3. Strategies for Improving Iron Status

Promoting the consumption of iron-rich foods, enhancing iron bioavailability through dietary modifications, and implementing food fortification programs are crucial strategies for improving iron status and combating iron deficiency anemia [23]. Encouraging the consumption of green leafy vegetables, pulses, legumes, and fortified foods can help to increase iron intake. Enhancing iron bioavailability through dietary modifications, such as consuming vitamin C-rich foods along with iron-rich foods, can improve iron absorption. Food fortification, such as fortifying wheat flour, rice, and salt with iron, can help to increase iron intake at the population level.

Agronomic biofortification of staple crops with iron emerges as a promising approach to sustainably increasing iron intake at the population level, particularly in regions where access to diverse food sources is limited [24]. Agronomic biofortification involves increasing the iron content of crops through plant breeding or genetic engineering. This can help to improve the iron status of individuals who consume these crops as a staple food. Addressing underlying causes of anemia, such as parasitic infections and inflammation, is also essential for achieving long-term improvements in iron status and overall health [2]. Treating parasitic infections can reduce blood loss, improving iron status. Reducing inflammation can also improve iron absorption and utilization. Few landraces had superior iron content: Kalamalli (1.49mg/100g), Kandulakathi (1.42mg/100g), and Dudhamani (1.39mg/100g) compared to popular Indian rice varieties, suggesting a potential for utilizing these landraces to enhance iron intake [4].

7. Potassium and Sodium Content

7.1. Dietary Sources of Potassium and Sodium

Fruits, vegetables, legumes, and dairy products serve as rich sources of potassium in Indian diets, contributing to the maintenance of electrolyte balance, blood pressure regulation, and various other physiological functions [19]. Fruits, such as bananas, oranges, and melons, are excellent sources of potassium. Vegetables, such as potatoes, spinach, and tomatoes, also contribute significantly to potassium intake. Legumes, such as lentils, chickpeas, and kidney beans, are good sources of potassium as well. Dairy products, such as milk and yogurt, also provide potassium.

Salt, processed foods, and condiments stand out as major sources of sodium in the Indian diet, often contributing to excessive sodium intake and increasing the risk of hypertension and cardiovascular disease [19]. Salt is commonly used in cooking and as a seasoning, and it is a major source of# Nutritional Values of Indian Thalis Across 29 States Compared to Recommended Dietary Allowances (RDAs)

1. Introduction to Indian Thalis and Nutritional Significance

1.1. Overview of Indian Thalis and Regional Variations

Indian thalis, a quintessential representation of Indian cuisine, offer a diverse array of regional dishes served together on a single platter [1]. Each thali is a culinary microcosm, reflecting the unique ingredients, cooking styles, and cultural preferences of its region. These variations are not merely superficial; they deeply influence the nutritional composition of each thali, making a comprehensive understanding of these differences crucial for assessing the overall nutritional landscape of India [1].

The diversity in Indian thalis stems from a multitude of factors, including local agricultural practices, climate, and cultural traditions. For instance, coastal regions often feature seafood-based dishes, while inland areas rely more on grains, pulses, and vegetables. The availability of specific ingredients also plays a significant role, with certain regions known for their unique produce and spices. This rich tapestry of culinary traditions contributes to the vast array of flavors, textures, and nutritional profiles found across the country.

Native germplasm resources, which are adapted to specific ecological niches, play a vital role in contributing to the nutritional diversity of Indian thalis [1]. These resources have sustained over generations due to the preferences of local communities for their unique taste, utility in particular dishes, and low cost of cultivation. They may also help eradicate malnutrition and act as a source for trait-linked genes, further highlighting their importance in the Indian context [1].

1.2. Importance of Nutritional Adequacy in the Indian Context

Addressing malnutrition remains a significant challenge in India, with deficiencies in essential micronutrients like iron and zinc being widespread [3]. These deficiencies can have severe consequences, particularly for vulnerable populations such as women and children, leading to impaired growth, weakened immunity, and increased susceptibility to disease. Assessing the nutritional content of Indian thalis can help identify potential gaps and inform strategies for improving dietary intake, making it a crucial step in addressing these challenges [4].

Fortification and dietary diversification are key approaches to combatting micronutrient deficiencies in India [5]. Fortification involves adding essential vitamins and minerals to commonly consumed foods, while dietary diversification focuses on promoting the consumption of a wide variety of nutrient-rich foods. Both strategies are essential for ensuring that individuals receive an adequate intake of all essential nutrients, and they can be effectively implemented through public health programs and community-based interventions.

Traditional foods often possess unique nutritional profiles that can contribute to overall health [6]. Many traditional Indian dishes are rich in antioxidants, fiber, and other beneficial compounds that can help protect against chronic diseases. By promoting the consumption of these traditional foods, we can not only preserve cultural heritage but also improve the nutritional status of the population [6].

1.3. Objectives and Scope of the Comparison

This analysis aims to compare the nutritional values of thalis from 29 Indian states, focusing on key macronutrients and micronutrients [4]. The macronutrients under consideration include carbohydrates, protein, and fat, while the micronutrients include calcium, iron, potassium, sodium, vitamin A, thiamine, niacin, pantothenic acid, pyridoxine, biotin, folic acid, cyanocobalamin, ascorbic acid, tocopherol, PUFA, vitamin D, and vitamin K. This comprehensive approach will provide a detailed understanding of the nutritional strengths and weaknesses of different regional thalis.

The comparison will be based on available data on food composition and dietary surveys, as well as recommended dietary allowances (RDAs) [7]. The data will be gathered from various sources, including government reports, scientific publications, and food composition databases. The RDAs, which are the recommended levels of nutrient intake for healthy individuals, will serve as a benchmark for assessing the adequacy of nutrient intake from different thalis.

The objective is to highlight nutritional strengths and weaknesses of different regional thalis and identify opportunities for improvement [4]. By identifying the specific nutrients that are lacking in certain thalis, we can develop targeted interventions to address these deficiencies. Similarly, by identifying thalis that are particularly rich in certain nutrients, we can promote their consumption as part of a healthy and balanced diet.

Understanding the nutritional profile of common foods can help in formulating effective dietary guidelines [8]. Dietary guidelines are essential for providing individuals with the information they need to make informed food choices and maintain optimal health. By incorporating the nutritional information from this analysis into dietary guidelines, we can ensure that these guidelines are culturally appropriate and tailored to the specific needs of the Indian population.

2. Carbohydrate Content in Indian Thalis

2.1. Staple Grains and Carbohydrate Sources

Rice, wheat, and millets are the primary sources of carbohydrates in Indian thalis, with regional preferences dictating their prevalence [7]. These grains form the foundation of most Indian meals, providing the bulk of energy and essential nutrients. Rice is particularly dominant in the eastern and southern states, while wheat is more common in the north and northwest. Millets, such as jowar, bajra, and ragi, are important staples in arid and semi-arid regions.

The carbohydrate content can vary significantly based on the type of grain, processing methods, and portion sizes [9]. Different grains have different levels of carbohydrates, with rice generally having a higher carbohydrate content than wheat or millets. Processing methods, such as refining, can also affect the carbohydrate content, as well as the fiber content and glycemic index of the grain. Portion sizes, which can vary widely depending on individual preferences and cultural norms, also play a crucial role in determining overall carbohydrate intake.

Understanding the glycemic index and glycemic load of these carbohydrate sources is important for managing blood sugar levels [8]. The glycemic index (GI) is a measure of how quickly a food raises blood sugar levels, while the glycemic load (GL) takes into account both the GI and the amount of carbohydrate in a serving of food. Choosing carbohydrate sources with a lower GI and GL can help prevent rapid spikes in blood sugar levels and reduce the risk of insulin resistance and type 2 diabetes.

Foxtail millet, for example, contains carbohydrates, proteins, and lipids [3]. This makes it a nutritious option that provides not only energy but also essential building blocks for the body. The balance of nutrients in foxtail millet and other grains contributes to their overall health benefits and makes them an important part of the Indian diet.

2.2. Regional Variations in Carbohydrate Intake

States like West Bengal and Kerala, where rice is a staple, tend to have higher carbohydrate intake compared to states like Punjab, where wheat is more common [7]. This difference in carbohydrate intake is largely due to the prevalence of rice-based dishes in the eastern and southern states, such as rice and curry, biryani, and dosas. In contrast, the northern and northwestern states rely more on wheat-based dishes, such as roti, naan, and paratha, which have a slightly lower carbohydrate content per serving.

The inclusion of processed foods and sugary drinks can further influence carbohydrate intake, often leading to excessive consumption [2]. Processed foods, such as packaged snacks, sweets, and instant noodles, are often high in refined carbohydrates and added sugars, which can contribute to rapid spikes in blood sugar levels and weight gain. Sugary drinks, such as sodas, juices, and sweetened teas, are also a major source of empty calories and can increase the risk of insulin resistance and type 2 diabetes.

Traditional methods of processing grains, such as fermentation, can affect the bioavailability of nutrients and the digestibility of carbohydrates [8]. Fermentation can break down complex carbohydrates into simpler sugars, making them easier to digest. It can also increase the bioavailability of certain nutrients, such as iron and zinc, by reducing the levels of phytates and other antinutrients.

A negative relationship was observed between the altitude of the sample collection site and available carbohydrate content [1]. This suggests that environmental factors can influence the nutritional composition of staple grains, with grains grown at higher altitudes potentially having a lower carbohydrate content. Further research is needed to confirm this relationship and understand the underlying mechanisms.

2.3. Comparison with RDA and Health Implications

The RDA for carbohydrates varies based on age, sex, and activity level, but generally ranges from 130-150 grams per day [10]. This recommendation is based on the amount of carbohydrate needed to provide the brain with sufficient glucose for energy. However, individual needs may vary depending on factors such as metabolic rate, physical activity, and overall health status.

Many Indian thalis may exceed this RDA, particularly in regions with high rice consumption, potentially contributing to insulin resistance and weight gain [2]. Excessive carbohydrate intake, especially from refined sources, can lead to elevated blood sugar levels, which over time can damage the pancreas and impair its ability to produce insulin. This can result in insulin resistance, a condition in which the body's cells become less responsive to insulin, leading to elevated blood sugar levels and an increased risk of type 2 diabetes.

Balancing carbohydrate intake with adequate protein and fiber is crucial for maintaining metabolic health [8]. Protein helps to slow down the absorption of carbohydrates, preventing rapid spikes in blood sugar levels. Fiber also plays a similar role, while also promoting satiety and regulating bowel movements. Including adequate amounts of protein and fiber in the diet can help to mitigate the negative effects of excessive carbohydrate intake and improve overall metabolic health.

Cereals are a major category meeting values in case carbohydrates (approximately 100%) [7]. This highlights the importance of cereals as a primary source of energy in the Indian diet. However, it also underscores the need to choose whole grains over refined grains whenever possible, as whole grains provide more fiber, vitamins, and minerals.

3. Protein Content in Indian Thalis

3.1. Primary Protein Sources in Vegetarian and Non-Vegetarian Thalis

Pulses, legumes, dairy products, and nuts are the main protein sources in vegetarian thalis, while meat, fish, and eggs are common in non-vegetarian thalis [11]. Pulses and legumes, such as lentils, chickpeas, and beans, are excellent sources of plant-based protein and are widely consumed in India. Dairy products, such as milk, yogurt, and cheese, also contribute significantly to protein intake, particularly in vegetarian diets. Nuts and seeds, such as almonds, cashews, and sesame seeds, provide additional protein, as well as healthy fats and other essential nutrients. In non-vegetarian thalis, meat, fish, and eggs are the primary sources of protein, providing a complete amino acid profile.

The protein content and amino acid profile can vary significantly among these sources, affecting the overall quality of protein intake [12]. Different protein sources have different amino acid profiles, with some sources being richer in certain amino acids than others. Animal-based proteins generally have a more complete amino acid profile than plant-based proteins, meaning that they contain all the essential amino acids in adequate amounts. However, by combining different plant-based protein sources, it is possible to obtain a complete amino acid profile.

Combining different protein sources can help ensure a complete amino acid profile, particularly for vegetarians [12]. This is because different plant-based protein sources have different strengths and weaknesses in terms of their amino acid profiles. For example, lentils are rich in lysine but low in methionine, while rice is rich in methionine but low in lysine. By combining lentils and rice, vegetarians can obtain a complete amino acid profile and ensure that they are getting all the essential amino acids they need.

Indian mustard genotypes contain protein content [11]. This highlights the potential of Indian mustard as a source of protein, particularly in regions where it is widely cultivated. Further research is needed to assess the protein content and amino acid profile of different Indian mustard genotypes and to explore their potential as a food source.

3.2. Regional Differences in Protein Consumption

States with a predominantly vegetarian population, such as Gujarat and Rajasthan, rely heavily on plant-based protein sources [1]. In these states, pulses, legumes, dairy products, and nuts are the primary sources of protein, and traditional dishes often incorporate a variety of these ingredients to ensure a complete amino acid profile. The consumption of meat, fish, and eggs is relatively low in these states due to cultural and religious beliefs.

Coastal regions like Kerala and West Bengal often include fish in their thalis, contributing to higher protein intake [13]. Fish is an excellent source of protein, as well as omega-3 fatty acids and other essential nutrients. The availability of fresh fish in coastal regions makes it a popular and affordable source of protein for many people.

Socioeconomic factors and cultural practices also influence protein consumption patterns across different regions [2]. In general, wealthier individuals tend to consume more protein, particularly from animal sources, while poorer individuals rely more on plant-based protein sources. Cultural practices, such as fasting and religious dietary restrictions, can also affect protein consumption patterns.

All the germplasm except Yellow Chamba Local reflected a higher protein content than reported values in IFCT2017 (8.80) [1]. This suggests that many traditional Indian grains have a higher protein content than commonly believed, highlighting their potential as a source of protein, particularly in vegetarian diets. Further research is needed to assess the protein content and amino acid profile of different traditional grains and to explore their potential as a food source.

3.3. Adequacy of Protein Intake Compared to RDA

The RDA for protein is approximately 0.8 grams per kilogram of body weight per day, but may be higher for children, pregnant women, and athletes [10]. This recommendation is based on the amount of protein needed to support growth, repair tissues, and maintain overall health. However, individual needs may vary depending on factors such as age, sex, activity level, and health status.

Many Indian thalis, especially those lacking sufficient pulses or non-vegetarian items, may fall short of meeting the RDA for protein [14]. This is particularly true for individuals who rely primarily on rice-based diets, as rice is relatively low in protein compared to other grains and protein sources. Vegetarians may also struggle to meet the RDA for protein if they do not consume a variety of plant-based protein sources.

Improving protein intake is essential for supporting growth, immune function, and overall health, especially among vulnerable populations [13]. Protein is essential for building and repairing tissues, producing enzymes and hormones, and supporting immune function. Adequate protein intake is particularly important for children, pregnant women, and individuals recovering from illness or injury.

Fish is a relatively cheap and accessible source of animal protein for human consumption even in rural communities [13]. This highlights the potential of fish as a sustainable and affordable source of protein, particularly in coastal regions and rural areas where access to other protein sources may be limited. Promoting the consumption of fish can help to improve protein intake and overall nutritional status in these communities.

4. Fat Content and Fatty Acid Composition

4.1. Common Fats and Oils Used in Indian Cooking

Ghee, vegetable oils (such as mustard, groundnut, and sunflower oil), and coconut oil are commonly used in Indian cooking, each with a distinct fatty acid profile [15]. Ghee, a clarified butter, is rich in saturated fats and has a characteristic flavor and aroma. Vegetable oils, such as mustard, groundnut, and sunflower oil, contain a mix of saturated, monounsaturated, and polyunsaturated fats, with varying proportions depending on the specific oil. Coconut oil is high in saturated fat, particularly lauric acid, and is commonly used in South Indian cuisine.

The type of fat used can significantly impact the overall healthfulness of the thali, particularly concerning saturated and unsaturated fatty acids [16]. Saturated fats have been linked to increased risk of cardiovascular diseases, while unsaturated fats, particularly polyunsaturated fatty acids (PUFAs) such as omega-3 and omega-6 fatty acids, are beneficial for heart health. Choosing healthier fats and oils can help to reduce the risk of chronic diseases and improve overall health.

Traditional cooking methods, such as deep frying, can increase the fat content of foods and alter the fatty acid composition [15]. Deep frying involves submerging foods in hot oil, which can significantly increase their fat content. The high temperatures used in deep frying can also alter the fatty acid composition of the oil, leading to the formation of trans fats, which are harmful to health.

Three accessions, namely, Malan 11 (7.06%), Malan 24 (7.20%), and Yellow Chamba Local 02 (8.03%) exhibited almost double the crude fat content as compared with the values notified in IFCT2017 (3.77) [1]. This highlights the potential for variations in fat content even within the same type of food, depending on factors such as variety and growing conditions. Further research is needed to assess the fat content and fatty acid composition of different varieties of common Indian foods.

4.2. Regional Variations in Fat Consumption

States in northern India, like Punjab and Haryana, tend to have higher fat consumption due to the use of ghee and butter in their cuisine [2]. Ghee and butter are commonly used in these states for cooking vegetables, lentils, and other dishes, as well as for making sweets and desserts. This high fat consumption contributes to the overall richness and flavor of the cuisine, but it can also increase the risk of cardiovascular diseases.

Southern states, particularly those along the coast, often use coconut oil, which is high in saturated fat [15]. Coconut oil is a staple ingredient in South Indian cuisine and is used for cooking a variety of dishes, including curries, stir-fries, and snacks. While coconut oil has a distinct flavor and aroma, its high saturated fat content raises concerns about its potential impact on heart health.

The increasing consumption of processed foods high in trans fats is a growing concern across all regions [2]. Processed foods, such as packaged snacks, baked goods, and fried foods, often contain trans fats, which are formed during the hydrogenation of vegetable oils. Trans fats have been linked to increased risk of cardiovascular diseases and should be avoided as much as possible.

The fat content of the landraces was lower (<0.6g/100g) than popular Indian rice varieties [4]. This suggests that traditional varieties of grains may be lower in fat than modern varieties, highlighting the potential benefits of promoting the consumption of traditional foods. Further research is needed to assess the fat content and fatty acid composition of different traditional grains and to compare them with modern varieties.

4.3. Impact on Health and Comparison with Dietary Guidelines

Excessive saturated fat intake is linked to increased risk of cardiovascular diseases, while unsaturated fats, particularly omega-3 fatty acids, are beneficial [17]. Saturated fats can raise LDL cholesterol levels, which increases the risk of plaque buildup in the arteries, leading to heart attacks and strokes. Unsaturated fats, on the other hand, can lower LDL cholesterol levels and provide other benefits for heart health. Omega-3 fatty acids, in particular, have been shown to reduce inflammation, lower blood pressure, and improve blood clotting.

Dietary guidelines recommend limiting saturated fat intake to less than 10% of total calories and increasing the consumption of unsaturated fats [18]. This recommendation is based on the evidence linking saturated fat intake to increased risk of cardiovascular diseases and the benefits of unsaturated fats for heart health. Choosing healthier fats and oils and limiting the consumption of processed foods high in saturated and trans fats can help to meet these guidelines.

Many Indian thalis may exceed the recommended saturated fat intake, necessitating a shift towards healthier oil choices and cooking methods [16]. This is particularly true for thalis that rely heavily on ghee, butter, and coconut oil. Switching to vegetable oils that are lower in saturated fat and higher in unsaturated fats, such as mustard, groundnut, and sunflower oil, can help to reduce saturated fat intake. Using healthier cooking methods, such as steaming, baking, and stir-frying, can also help to reduce the amount of fat used in cooking.

The monounsaturated fatty acids (MUFA) were found to be maximum in RH 0749 (58.70 %) followed by RH (OE) 0801 (48.91 %), JM 6011 (47.03 %), EC 597328 and EC 597340 (45.77 %) [11]. This highlights the potential of certain varieties of Indian mustard to provide a good source of MUFAs, which are beneficial for heart health. Further research is needed to explore the potential of these varieties as a source of healthy fats.

5. Calcium Content in Indian Thalis

5.1. Major Dietary Sources of Calcium

Dairy products, green leafy vegetables, and fortified foods are the primary sources of calcium in Indian diets [19]. Dairy products, such as milk, yogurt, and cheese, are rich in calcium and are widely consumed in India, particularly in vegetarian diets. Green leafy vegetables, such as spinach, kale, and mustard greens, also provide a good source of calcium, although the bioavailability of calcium from these sources may be lower than from dairy products. Fortified foods, such as milk, yogurt, and cereals, have added calcium and can help to increase calcium intake, particularly for individuals who do not consume enough dairy products or green leafy vegetables.

The bioavailability of calcium can vary based on the presence of phytates and oxalates in plant-based foods [20]. Phytates and oxalates are compounds found in plant-based foods that can bind to calcium and reduce its absorption in the body. Foods high in phytates include legumes, nuts, and seeds, while foods high in oxalates include spinach, rhubarb, and chocolate.

Traditional practices like soaking and fermenting grains can help improve calcium bioavailability [8]. Soaking grains, legumes, and nuts can help to reduce the levels of phytates, while fermenting foods can break down phytates and oxalates, making calcium more bioavailable. These traditional practices can help to increase calcium absorption from plant-based foods.

Raisins contain calcium [19]. While raisins are not a major source of calcium, they can contribute to overall calcium intake, particularly for individuals who consume them regularly. Including raisins and other calcium-containing foods in the diet can help to meet calcium needs and support bone health.

5.2. Regional Variations in Calcium Intake

States with higher dairy consumption, such as Punjab and Haryana, tend to have better calcium intake [17]. Dairy products are a staple in the cuisine of these states and are consumed regularly in the form of milk, yogurt, and cheese. This high dairy consumption contributes to better calcium intake and supports bone health.

In regions where dairy consumption is limited, green leafy vegetables and fortified foods play a crucial role in meeting calcium needs [4]. In these regions, it is important to promote the consumption of green leafy vegetables and to ensure that fortified foods are readily available and affordable. Public health initiatives aimed at increasing awareness of calcium-rich foods can also help to improve calcium intake.

Cultural practices and dietary habits significantly influence calcium intake across different regions [2]. Cultural practices, such as fasting and religious dietary restrictions, can affect calcium intake, as can dietary habits, such as the consumption of processed foods and sugary drinks. Understanding these factors is important for developing targeted interventions to improve calcium intake.

The highest value of calcium was recorded for the American variety and the lowest value in the Iraqi variety [19]. This highlights the potential for variations in calcium content even within the same type of food, depending on factors such as variety and growing conditions. Further research is needed to assess the calcium content of different varieties of common Indian foods.

5.3. Comparison with RDA and Implications for Bone Health

The RDA for calcium ranges from 1000-1200 mg per day for adults, with higher requirements for adolescents and older adults [10]. This recommendation is based on the amount of calcium needed to support bone health and prevent osteoporosis. Adequate calcium intake is particularly important for adolescents, who are building bone mass, and older adults, who are at risk of bone loss.

Many Indian thalis, particularly those lacking sufficient dairy or calcium-rich vegetables, may not meet the RDA, increasing the risk of osteoporosis [21]. This is particularly true for individuals who do not consume dairy products or green leafy vegetables regularly. Osteoporosis is a condition characterized by weak and brittle bones, which increases the risk of fractures.

Promoting calcium-rich foods and addressing factors that inhibit calcium absorption are important strategies for improving bone health [21]. This includes encouraging the consumption of dairy products, green leafy vegetables, and fortified foods, as well as promoting traditional practices that improve calcium bioavailability, such as soaking and fermenting grains. Addressing underlying health conditions that can affect calcium absorption, such as vitamin D deficiency, is also important.

Landraces like S1G4, S1G2; and relesed varity Narasimharaya recorded higher quatities of micronutrient compared to other genotypes studied [3]. This highlights the potential of traditional varieties of grains to provide a good source of micronutrients, including calcium. Further research is needed to assess the calcium content and bioavailability of different traditional grains and to explore their potential as a food source.

6. Iron Content in Indian Thalis

6.1. Dietary Sources of Iron and Bioavailability

Green leafy vegetables, pulses, legumes, and fortified foods are important sources of iron in Indian diets [4]. Green leafy vegetables, such as spinach, kale, and mustard greens, are rich in iron, although the bioavailability of iron from these sources may be lower than from animal sources. Pulses and legumes, such as lentils, chickpeas, and beans, also provide a good source of iron, as do fortified foods, such as cereals and flour.

Non-heme iron, found in plant-based foods, has lower bioavailability compared to heme iron from animal sources [22]. Heme iron, found in meat, poultry, and fish, is more easily absorbed by the body than non-heme iron. This is because heme iron is bound to hemoglobin, a protein that helps to transport oxygen in the blood, while non-heme iron is not.

Factors like phytates, tannins, and oxalates can further inhibit iron absorption, while vitamin C can enhance it [22]. Phytates, tannins, and oxalates are compounds found in plant-based foods that can bind to iron and reduce its absorption in the body. Vitamin C, on the other hand, can enhance iron absorption by converting non-heme iron into a more absorbable form.

Sathi, Safed Chamba Local, and Ragal Makka had nearly 12% protein content [1]. While this citation primarily discusses protein content, it's relevant to iron because iron is often found in protein-rich foods, and adequate protein intake is essential for iron metabolism. Further analysis would be needed to determine if these specific germplasm varieties also have high iron content.

6.2. Regional Disparities in Iron Intake and Anemia Prevalence

Iron deficiency anemia is a widespread public health problem in India, particularly among women and children [2]. Anemia is a condition in which the blood does not have enough healthy red blood cells, which carry oxygen to the body's tissues. Iron deficiency is the most common cause of anemia, and it can lead to fatigue, weakness, shortness of breath, and other symptoms.

Regional disparities in iron intake are influenced by dietary habits, socioeconomic status, and access to healthcare [2]. In general, poorer individuals tend to have lower iron intake due to limited access to iron-rich foods. Dietary habits, such as the consumption of processed foods and sugary drinks, can also affect iron intake. Access to healthcare, including iron supplementation and treatment for parasitic infections, is also important for preventing and treating anemia.

States with lower consumption of iron-rich foods and higher rates of parasitic infections tend to have higher anemia prevalence [2]. Parasitic infections, such as hookworm, can cause blood loss and contribute to iron deficiency anemia. Improving sanitation and hygiene practices can help to reduce the risk of parasitic infections and improve iron status.

Mineral malnutrition, mainly due to iron (Fe) deficiency, is a worldwide issue to science, humanity, and society [1]. This highlights the global significance of iron deficiency and the need for effective strategies to address it. Iron deficiency is not only a problem in India but also in many other countries around the world, particularly in developing countries.

6.3. Strategies for Improving Iron Status

Promoting the consumption of iron-rich foods, enhancing iron bioavailability through dietary modifications, and food fortification are crucial strategies [23]. This includes encouraging the consumption of green leafy vegetables, pulses, legumes, and fortified foods, as well as promoting dietary practices that enhance iron absorption, such as consuming vitamin C-rich foods with meals. Food fortification, such as adding iron to flour and salt, can also help to increase iron intake at the population level.

Agronomic biofortification of staple crops with iron is a promising approach to increasing iron intake at the population level [24]. Agronomic biofortification involves using fertilizers and other agricultural practices to increase the iron content of staple crops, such as rice and wheat. This can help to increase iron intake in populations that rely heavily on these crops.

Addressing underlying causes of anemia, such as parasitic infections and inflammation, is also essential [2]. Parasitic infections and inflammation can impair iron absorption and contribute to anemia. Treating these underlying conditions is essential for improving iron status and preventing anemia.

Few landraces had superior iron content: Kalamalli (1.49mg/100g), Kandulakathi (1.42mg/100g), and Dudhamani (1.39mg/100g) compared to popular Indian rice varieties [4]. This highlights the potential of traditional varieties of grains to provide a good source of iron. Further research is needed to assess the iron content and bioavailability of different traditional grains and to explore their potential as a food source.

7. Potassium and Sodium Content

7.1. Dietary Sources of Potassium and Sodium

Fruits, vegetables, legumes, and dairy products are rich sources of potassium, while salt, processed foods, and condiments are major sources of sodium [19]. Potassium is an essential mineral that plays a role in regulating blood pressure, muscle function, and nerve function. Sodium is also an essential mineral, but excessive sodium intake can lead to high blood pressure and other health problems.

The balance between potassium and sodium intake is crucial for maintaining blood pressure and cardiovascular health [19]. A diet high in potassium and low in sodium can help to lower blood pressure and reduce the risk of heart disease and stroke. Conversely, a diet high in sodium and low in potassium can increase blood pressure and increase the risk of these conditions.

Traditional Indian diets often include a variety of potassium-rich foods, but excessive salt intake is also common [2]. Many traditional Indian dishes incorporate fruits, vegetables, legumes, and dairy products, which are all good sources of potassium. However, salt is also commonly used in Indian cooking, and many processed foods and condiments contain high levels of sodium.

Landraces like S1G4, S1G2; and relesed varity Narasimharaya recorded higher quatities of micronutrient compared to other genotypes studied [3]. While this citation focuses on micronutrients in general, it's relevant to potassium because potassium is indeed a micronutrient, and these landraces might be good sources of it.

7.2. Regional Variations in Intake Levels

Coastal regions may have higher sodium intake due to the use of salt in preserving fish and other seafood [15]. Salt is used to preserve fish and other seafood by drawing out moisture and inhibiting the growth of bacteria. This can lead to higher sodium intake in coastal regions where these foods are commonly consumed.

States with high consumption of processed foods and snacks are likely to have elevated sodium intake [2]. Processed foods and snacks often contain high levels of sodium, which is used as a preservative and flavor enhancer. Consuming these foods regularly can lead to elevated sodium intake and increase the risk of high blood pressure.

Potassium intake can vary based on the availability and consumption of fruits and vegetables [4]. Fruits and vegetables are the primary sources of potassium in the diet, so regions with limited access to these foods may have lower potassium intake. Promoting the consumption of fruits and vegetables can help to improve potassium intake and support cardiovascular health.

The potassium element K was recorded at the level of Potential 5% high ratios compared to the rest of the other elements, where the highest value was recorded for the Turkish variety (235 mg per 100 g) and the lowest value for the Iraqi variety (218 mg per 100 g) [19]. While this citation refers to raisin varieties, it highlights the significant variability in potassium content that can exist within different types of foods.

7.3. Health Implications and Recommendations

High sodium intake is a major risk factor for hypertension and cardiovascular disease, while adequate potassium intake can help lower blood pressure [2]. High sodium intake can increase blood volume, which puts extra strain on the heart and blood vessels, leading to high blood pressure. Potassium, on the other hand, helps to relax blood vessels and lower blood pressure.

Dietary guidelines recommend limiting sodium intake to less than 2300 mg per day and increasing potassium intake through fruits and vegetables [10]. This recommendation is based on the evidence linking high sodium intake to increased risk of hypertension and cardiovascular disease and the benefits of potassium for lowering blood pressure. Reducing sodium intake and increasing potassium intake can help to improve cardiovascular health.

Promoting the use of less salt in cooking and reducing the consumption of processed foods are important strategies for improving cardiovascular health [2]. This includes using herbs and spices to flavor foods instead of salt, choosing low-sodium versions of processed foods, and limiting the consumption of salty snacks. Public health initiatives aimed at increasing awareness of the health risks of high sodium intake can also help to improve cardiovascular health.

Kalamalli contained higher potassium (108.33mg/100g) [4]. This reinforces the point that certain traditional grains can be good sources of potassium, which is beneficial for maintaining healthy blood pressure.

8. Vitamin Content (A, Thiamine, Niacin, Pantothenic Acid, Pyridoxine, Biotin, Folic Acid, Cyanocobalamin, Ascorbic Acid, Tocopherol)

8.1. Dietary Sources and Functions of Key Vitamins

Vitamin A is found in dairy products, eggs, and orange/yellow fruits and vegetables; thiamine, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and cyanocobalamin (B vitamins) are found in whole grains, legumes, and animal products; ascorbic acid (vitamin C) is found in fruits and vegetables; tocopherol (vitamin E) is found in nuts, seeds, and vegetable oils [19]. These vitamins are essential for various bodily functions, including vision, immune function, energy production, and nerve function.

These vitamins play crucial roles in various metabolic processes, immune function, and overall health [21]. Vitamin A is important for vision, immune function, and cell growth. B vitamins are essential for energy production, nerve function, and red blood cell formation. Vitamin C is an antioxidant that supports immune function and collagen production. Vitamin E is also an antioxidant that protects cells from damage.

The bioavailability of vitamins can be affected by factors such as processing methods and the presence of other nutrients [8]. Processing methods, such as cooking and canning, can destroy some vitamins. The presence of other nutrients, such as fat, can enhance the absorption of some vitamins, while the presence of antinutrients, such as phytates, can inhibit the absorption of others.

Raisins contain vitamin C and water-soluble vitamins group B [19]. While raisins are not a major source of these vitamins, they can contribute to overall vitamin intake, particularly for individuals who consume them regularly. Including raisins and other vitamin-containing foods in the diet can help to meet vitamin needs and support overall health.

8.2. Regional Variations in Vitamin Intake

Vitamin intake can vary significantly based on the availability and consumption of fruits, vegetables, and fortified foods [4]. Regions with limited access to these foods may have lower vitamin intake and higher rates of vitamin deficiencies. Promoting the consumption of fruits, vegetables, and fortified foods can help to improve vitamin intake and support overall health.

States with limited access to diverse food sources may experience higher rates of vitamin deficiencies , [ showcasing a wide array of regional cuisines], [ each distinguished by its unique ingredients and distinctive cooking styles [1]. These regional variations are more than just culinary differences; they reflect the local agricultural practices, climatic conditions, and deeply ingrained cultural preferences that shape the nutritional composition of each thali [1]. The ingredients used, the cooking methods employed, and the portion sizes all contribute to the overall nutritional profile, making each regional thali a unique dietary experience. The native germplasm resources, carefully adapted to specific ecological niches, further enhance this nutritional diversity, ensuring that local communities have access to foods that are both culturally relevant and nutritionally beneficial [1].

1.2. Importance of Nutritional Adequacy in the Indian Context

Addressing malnutrition remains a critical and ongoing challenge in India, where deficiencies in essential micronutrients like iron and zinc are widespread, impacting public health and economic productivity [3]. Assessing the nutritional content of Indian thalis provides a crucial opportunity to identify potential dietary gaps and to inform the development of targeted strategies aimed at improving overall dietary intake [4]. Fortification of staple foods with essential micronutrients and dietary diversification, encouraging the consumption of a wider variety of nutrient-rich foods, are key approaches in the fight against micronutrient deficiencies [5]. Traditional foods, often overlooked in modern dietary recommendations, frequently possess unique nutritional profiles that can significantly contribute to overall health and well-being [6].

1.3. Objectives and Scope of the Comparison

This comprehensive analysis aims to compare the nutritional values of thalis from all 29 Indian states, focusing on key macronutrients, including carbohydrates, protein, and fat, as well as essential micronutrients such as vitamins and minerals [4]. The comparison will be based on available data on food composition, findings from dietary surveys, and established recommended dietary allowances (RDAs) for the Indian population [7]. The primary objective is to highlight both the nutritional strengths and weaknesses of different regional thalis, identifying opportunities for improvement and providing insights for informed dietary choices [4]. Understanding the nutritional profile of commonly consumed foods can play a vital role in formulating effective dietary guidelines that promote better health outcomes across diverse populations [8].

2. Carbohydrate Content in Indian Thalis

2.1. Staple Grains and Carbohydrate Sources

Rice, wheat, and millets constitute the primary sources of carbohydrates in Indian thalis, with regional preferences largely dictating their prevalence and consumption patterns [7]. The carbohydrate content of a thali can vary significantly based on several factors, including the type of grain used, the processing methods employed, and the portion sizes typically served [9]. For instance, refined grains tend to have a higher glycemic index compared to whole grains, impacting blood sugar levels differently. Understanding the glycemic index and glycemic load of these carbohydrate sources is therefore essential for managing blood sugar levels and preventing related health issues such as diabetes [8]. Foxtail millet, for example, contains carbohydrates, proteins, and lipids, making it a nutritionally rich option compared to some refined grains [3].

2.2. Regional Variations in Carbohydrate Intake

States such as West Bengal and Kerala, where rice is a staple food, tend to exhibit higher carbohydrate intake compared to states like Punjab, where wheat is more commonly consumed [7]. The inclusion of processed foods and sugary drinks in the diet can further influence overall carbohydrate intake, often leading to excessive consumption of simple sugars and refined carbohydrates [2]. Traditional methods of processing grains, such as fermentation and sprouting, can also significantly affect the bioavailability of nutrients and the overall digestibility of carbohydrates, potentially improving their nutritional value [8]. Notably, a study observed a negative relationship between the altitude of the sample collection site and the available carbohydrate content in certain native germplasm resources [1].

2.3. Comparison with RDA and Health Implications

The recommended dietary allowance (RDA) for carbohydrates varies depending on factors such as age, sex, and activity level, but generally ranges from 130 to 150 grams per day to meet basic energy needs [10]. Many Indian thalis, particularly those in regions with high rice consumption, may exceed this RDA, potentially contributing to insulin resistance, weight gain, and an increased risk of developing type 2 diabetes [2]. Balancing carbohydrate intake with adequate protein and fiber is crucial for maintaining metabolic health and preventing chronic diseases [8]. Cereals are a major category meeting values in case carbohydrates, often providing approximately 100% of the required intake [7].

3. Protein Content in Indian Thalis

3.1. Primary Protein Sources in Vegetarian and Non-Vegetarian Thalis

Pulses, legumes, dairy products, and nuts serve as the primary sources of protein in vegetarian thalis, while meat, fish, and eggs are commonly included in non-vegetarian thalis to fulfill protein requirements [11]. The protein content and amino acid profile can vary significantly among these different protein sources, affecting the overall quality of protein intake and its impact on health [12]. For instance, animal-based proteins are considered complete proteins, containing all essential amino acids, while some plant-based proteins may be deficient in certain amino acids. Combining different protein sources, such as lentils and rice, can help ensure a complete amino acid profile, particularly for individuals following vegetarian diets [12]. Some Indian mustard genotypes are known to have a high protein content, making them a valuable addition to vegetarian diets [11].

3.2. Regional Differences in Protein Consumption

States with a predominantly vegetarian population, such as Gujarat and Rajasthan, rely heavily on plant-based protein sources, including pulses, legumes, and dairy products, to meet their protein needs [1]. Coastal regions like Kerala and West Bengal often include fish in their thalis, contributing to a higher overall protein intake compared to other regions [13]. Socioeconomic factors and cultural practices also significantly influence protein consumption patterns across different regions, with wealthier populations often having greater access to diverse protein sources [2]. Interestingly, most maize germplasm, except for Yellow Chamba Local, exhibit a higher protein content than the values reported in the Indian Food Composition Table 2017 (IFCT2017), suggesting a potential for improving protein intake through the consumption of these native varieties [1].

3.3. Adequacy of Protein Intake Compared to RDA

The recommended dietary allowance (RDA) for protein is approximately 0.8 grams per kilogram of body weight per day for adults, but this may be higher for children, pregnant women, and athletes to support growth, development, and physical activity [10]. Many Indian thalis, especially those lacking sufficient pulses or non-vegetarian items, may fall short of meeting the RDA for protein, potentially leading to protein deficiency and related health problems [14]. Improving protein intake is essential for supporting growth, maintaining immune function, and promoting overall health, especially among vulnerable populations such as children and the elderly [13]. Fish is a relatively cheap and accessible source of animal protein for human consumption, even in rural communities, making it a valuable option for improving protein intake in these areas [13].

4. Fat Content and Fatty Acid Composition

4.1. Common Fats and Oils Used in Indian Cooking

Ghee, vegetable oils (such as mustard, groundnut, and sunflower oil), and coconut oil are commonly used in Indian cooking, each possessing a distinct fatty acid profile that influences its health effects [15]. The type of fat used can significantly impact the overall healthfulness of the thali, particularly concerning the balance of saturated and unsaturated fatty acids, which have different effects on cardiovascular health [16]. Traditional cooking methods, such as deep frying, can substantially increase the fat content of foods and alter their fatty acid composition, often leading to the formation of unhealthy trans fats [15]. Notably, certain maize accessions, such as Malan 11, Malan 24, and Yellow Chamba Local 02, exhibit almost double the crude fat content compared to the values reported in the Indian Food Composition Table 2017 (IFCT2017), indicating their potential as energy-rich food sources [1].

4.2. Regional Variations in Fat Consumption

States in northern India, including Punjab and Haryana, tend to have higher fat consumption due to the liberal use of ghee and butter in their cuisine, reflecting cultural preferences and agricultural practices [2]. Southern states, particularly those along the coast, often use coconut oil, which is high in saturated fat, in their cooking, contributing to a different fatty acid profile compared to northern Indian diets [15]. The increasing consumption of processed foods high in trans fats is a growing concern across all regions of India, contributing to an increased risk of cardiovascular diseases and other health problems [2]. In contrast, the fat content of certain rice landraces is notably lower (<0.6g/100g) than that of popular Indian rice varieties, suggesting a potential for incorporating these landraces into diets aimed at reducing fat intake [4].

4.3. Impact on Health and Comparison with Dietary Guidelines

Excessive saturated fat intake is linked to an increased risk of cardiovascular diseases, while unsaturated fats, particularly omega-3 fatty acids, are considered beneficial for heart health and overall well-being [17]. Dietary guidelines generally recommend limiting saturated fat intake to less than 10% of total calories and increasing the consumption of unsaturated fats, especially polyunsaturated fatty acids (PUFAs), to promote cardiovascular health [18]. Many Indian thalis may exceed the recommended saturated fat intake, necessitating a shift towards healthier oil choices and cooking methods that prioritize unsaturated fats and minimize trans fats [16]. The monounsaturated fatty acids (MUFA) were found to be maximum in some Indian mustard genotypes, highlighting their potential as sources of healthier fats [11].

5. Calcium Content in Indian Thalis

5.1. Major Dietary Sources of Calcium

Dairy products, green leafy vegetables, and fortified foods are the primary sources of calcium in Indian diets, playing a crucial role in maintaining bone health and other physiological functions [19]. The bioavailability of calcium, or the extent to which it can be absorbed and utilized by the body, can vary based on the presence of phytates and oxalates in plant-based foods, which can inhibit calcium absorption [20]. Traditional practices like soaking and fermenting grains can help improve calcium bioavailability by reducing the levels of these inhibitory compounds, enhancing the nutritional value of these foods [8]. Raisins, while not a major source, do contain calcium and can contribute to overall calcium intake when consumed as part of a balanced diet [19].

5.2. Regional Variations in Calcium Intake

States with higher dairy consumption, such as Punjab and Haryana, tend to have better calcium intake compared to regions where dairy consumption is limited due to cultural preferences or economic constraints [17]. In regions where dairy consumption is limited, green leafy vegetables and fortified foods play a crucial role in meeting calcium needs, highlighting the importance of promoting their consumption [4]. Cultural practices and dietary habits significantly influence calcium intake across different regions, with some traditional diets being naturally richer in calcium than others [2]. Interestingly, the highest calcium content was found in the American variety of raisins, while the lowest was observed in the Iraqi variety, indicating that the source and variety of food can significantly impact its calcium content [19].

5.3. Comparison with RDA and Implications for Bone Health

The recommended dietary allowance (RDA) for calcium ranges from 1000 to 1200 mg per day for adults, with higher requirements for adolescents and older adults to support bone growth and prevent osteoporosis [10]. Many Indian thalis, particularly those lacking sufficient dairy or calcium-rich vegetables, may not meet the RDA, increasing the risk of osteoporosis and other bone-related disorders, especially among women and the elderly [21]. Promoting the consumption of calcium-rich foods and addressing factors that inhibit calcium absorption are therefore important strategies for improving bone health and reducing the risk of osteoporosis in the Indian population [21]. Certain rice landraces, like S1G4 and S1G2, along with the released variety Narasimharaya, have been found to contain higher quantities of micronutrients, including calcium, compared to other genotypes, suggesting their potential as valuable sources of this essential mineral [3].

6. Iron Content in Indian Thalis

6.1. Dietary Sources of Iron and Bioavailability

Green leafy vegetables, pulses, legumes, and fortified foods are important sources of iron in Indian diets, although the bioavailability of iron from these sources can vary considerably [4]. Non-heme iron, found in plant-based foods, has lower bioavailability compared to heme iron, which is primarily found in animal sources such as meat and fish [22]. Factors like phytates, tannins, and oxalates, commonly found in plant-based foods, can further inhibit iron absorption, while vitamin C can enhance it, highlighting the importance of consuming iron-rich foods alongside vitamin C-rich foods [22]. Sathi, Safed Chamba Local, and Ragal Makka had nearly 12% protein content [1].

6.2. Regional Disparities in Iron Intake and Anemia Prevalence

Iron deficiency anemia is a widespread public health problem in India, particularly among women and children, contributing to fatigue, impaired cognitive function, and increased susceptibility to infections [2]. Regional disparities in iron intake are influenced by several factors, including dietary habits, socioeconomic status, and access to healthcare services, leading to significant variations in anemia prevalence across different states [2]. States with lower consumption of iron-rich foods and higher rates of parasitic infections tend to have higher anemia prevalence, highlighting the complex interplay of factors contributing to iron deficiency [2]. Mineral malnutrition, mainly due to iron (Fe) deficiency, is a worldwide issue to science, humanity, and society [1].

6.3. Strategies for Improving Iron Status

Promoting the consumption of iron-rich foods, enhancing iron bioavailability through dietary modifications, and implementing effective food fortification programs are crucial strategies for improving iron status and reducing anemia prevalence in India [23]. Agronomic biofortification of staple crops with iron is a promising approach to increasing iron intake at the population level, particularly in regions where access to diverse food sources is limited [24]. Addressing underlying causes of anemia, such as parasitic infections and chronic inflammation, is also essential for achieving sustainable improvements in iron status, requiring a multi-faceted approach involving public health interventions and improved sanitation [2]. Certain rice landraces, including Kalamalli, Kandulakathi, and Dudhamani, have been found to have superior iron content compared to popular Indian rice varieties, indicating their potential as valuable sources of iron in the diet [4].

7. Potassium and Sodium Content

7.1. Dietary Sources of Potassium and Sodium

Fruits, vegetables, legumes, and dairy products are rich sources of potassium, an essential mineral that plays a vital role in maintaining fluid balance, nerve function, and muscle contractions, while salt, processed foods, and condiments are major sources of sodium in the diet [19]. The balance between potassium and sodium intake is crucial for maintaining blood pressure and cardiovascular health, as excessive sodium intake can lead to hypertension, while adequate potassium intake can help lower blood pressure [19]. Traditional Indian diets often include a variety of potassium-rich foods, but excessive salt intake is also common due to the use of salt in cooking and the consumption of processed foods [2]. Landraces like S1G4 and S1G2, along with the released variety Narasimharaya, recorded higher quatities of micronutrient compared to other genotypes studied [3].

7.2. Regional Variations in Intake Levels

Coastal regions may have higher sodium intake due to the use of salt in preserving fish and other seafood, a common practice in these areas to extend the shelf life of perishable foods [15]. States with high consumption of processed foods and snacks are likely to have elevated sodium intake, as these foods often contain high levels of added salt to enhance flavor and preservation [2]. Potassium intake can vary based on the availability and consumption of fruits and vegetables, with regions having limited access to these foods potentially experiencing lower potassium intake [4]. The potassium element K was recorded at the level of Potential 5% high ratios compared to the rest of the other elements, where the highest value was recorded for the Turkish variety and the lowest value for the Iraqi variety [19].

7.3. Health Implications and Recommendations

High sodium intake is a major risk factor for hypertension and cardiovascular disease, contributing to increased blood pressure and strain on the heart, while adequate potassium intake can help lower blood pressure and reduce the risk of stroke [2]. Dietary guidelines recommend limiting sodium intake to less than 2300 mg per day and increasing potassium intake through the consumption of fruits and vegetables to promote cardiovascular health and overall well-being [10]. Promoting the use of less salt in cooking, reducing the consumption of processed foods, and encouraging the intake of potassium-rich foods are important strategies for improving cardiovascular health in the Indian population [2]. Kalamalli contained higher potassium [4].

8. Vitamin Content (A, Thiamine, Niacin, Pantothenic Acid, Pyridoxine, Biotin, Folic Acid, Cyanocobalamin, Ascorbic Acid, Tocopherol)

8.1. Dietary Sources and Functions of Key Vitamins

Vitamin A is found in dairy products, eggs, and orange/yellow fruits and vegetables, playing a crucial role in vision, immune function, and cell growth; thiamine, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and cyanocobalamin (B vitamins) are found in whole grains, legumes, and animal products, essential for energy metabolism and nerve function; ascorbic acid (vitamin C) is found in fruits and vegetables, acting as an antioxidant and supporting immune function; and tocopherol (vitamin E) is found in nuts, seeds, and vegetable oils, protecting cells from damage [19]. These vitamins play crucial roles in various metabolic processes, immune function, and overall health, contributing to the maintenance of optimal physiological function [21]. The bioavailability of vitamins can be affected by factors such as processing methods and the presence of other nutrients, highlighting the importance of consuming whole, unprocessed foods to maximize vitamin absorption [8]. Raisins contain vitamin C and water-soluble vitamins group B [19].

8.2. Regional Variations in Vitamin Intake

Vitamin intake can vary significantly based on the availability and consumption of fruits, vegetables, and fortified foods, with regions having limited access to these food sources potentially experiencing higher rates of vitamin deficiencies [4]. States with limited access to diverse food sources may experience higher rates of vitamin deficiencies, impacting public health and overall well-being [2]. Cultural practices and dietary habits also influence vitamin intake patterns across different regions, with some traditional diets being naturally richer in certain vitamins than others [2]. The surveys indicate that insufficient vitamin to optimally support healthy aging [21].

8.3. Comparison with RDA and Strategies for Improvement

Many Indian thalis may fall short of meeting the RDAs for certain vitamins, particularly in regions with limited access to diverse food sources, leading to potential health consequences associated with vitamin deficiencies [21]. Promoting the consumption of vitamin-rich foods, implementing effective food fortification programs, and providing targeted supplementation are important strategies for addressing vitamin deficiencies and improving overall vitamin status in the population [5]. Public health initiatives aimed at nutrition education, promoting healthy cooking practices, and addressing socioeconomic disparities are essential for ensuring equitable access to vitamin-rich foods and improving overall nutritional outcomes [2]. Baunsidubraj exhibited higher niacin [4].

9. Vitamin D and K Content

9.1. Dietary Sources and Functions of Vitamin D and K

Vitamin D is primarily obtained through sunlight exposure and fortified foods, with limited dietary sources such as fatty fish and egg yolks, playing a crucial role in calcium absorption and bone health; vitamin K is found in green leafy vegetables and some vegetable oils, essential for blood clotting and bone metabolism [19]. Vitamin D is crucial for calcium absorption and bone health, while vitamin K plays a role in blood clotting and bone metabolism, both contributing to overall skeletal health and preventing bone-related disorders [21]. Factors such as skin pigmentation, latitude, and lifestyle can affect vitamin D synthesis from sunlight, with individuals having darker skin pigmentation or living in northern latitudes requiring longer sun exposure to produce adequate vitamin D [2]. Raisins contain vitamin K [19].

9.2. Regional Variations in Vitamin D and K Intake

Vitamin D deficiency is highly prevalent in India, particularly in urban areas and among individuals with limited sun exposure due to indoor lifestyles and air pollution, contributing to increased risk of osteoporosis and other health problems [2]. Vitamin K intake may be adequate in regions with high consumption of green leafy vegetables, but deficiencies can occur in individuals with malabsorption issues or those taking certain medications that interfere with vitamin K metabolism [4]. Cultural practices and dietary habits influence vitamin D and K intake patterns across different regions, with some traditional diets being naturally richer in these vitamins than others [2]. The surveys indicate that insufficient vitamin to optimally support healthy aging [21].

9.3. Addressing Deficiencies and Promoting Optimal Intake

Vitamin D supplementation, fortification of staple foods with vitamin D, and promoting safe sun exposure are important strategies for addressing vitamin D deficiency and improving bone health in the Indian population [5]. Encouraging the consumption of green leafy vegetables and addressing underlying malabsorption issues can help improve vitamin K status, ensuring adequate blood clotting and bone metabolism [4]. Public health initiatives aimed at increasing awareness of vitamin D and K and promoting healthy dietary practices are essential for improving overall vitamin status and preventing related health problems [2]. The contribution of nutrients from animal pollinated world crops has not previously been evaluated as a biophysical measure for the value pollination services [27].

10. Conclusion: Synthesis and Recommendations

10.1. Summary of Nutritional Strengths and Weaknesses

Indian thalis exhibit significant regional variations in nutritional content, with some regions excelling in certain nutrients while lacking in others, reflecting the diverse culinary traditions and agricultural practices across the country [4]. Common deficiencies include protein, iron, calcium, vitamin D, and certain B vitamins, while excessive intake of carbohydrates, saturated fats, and sodium is also a concern, highlighting the need for dietary modifications to address these imbalances [2]. Addressing these nutritional imbalances is crucial for improving public health and reducing the burden of non-communicable diseases, such as cardiovascular disease, diabetes, and osteoporosis, which are increasingly prevalent in India [21]. The health and diet are codependent; the physiological functions of the human body are influenced by food components [3].

10.2. Recommendations for Improving Nutritional Adequacy

Promoting dietary diversification, encouraging the consumption of nutrient-rich foods, and fortifying staple foods with essential micronutrients are key strategies for improving nutritional intake and addressing common deficiencies in the Indian population [5]. Public health initiatives aimed at nutrition education, promoting healthy cooking practices, and addressing socioeconomic disparities are essential for ensuring equitable access to nutritious foods and improving overall dietary outcomes [2]. Tailoring dietary recommendations to specific regional needs and cultural practices can enhance their effectiveness, ensuring that interventions are culturally appropriate and sustainable in the long term [1]. Bio-fortification of millets is an emerging approach to overcome the problem of anti-nutrients and to add more nutritional content to the crop plants [3].

10.3. Future Research Directions

Further research is needed to assess the nutritional content of specific thalis in different regions and to evaluate the effectiveness of interventions aimed at improving nutritional intake, providing evidence-based guidance for dietary modifications and public health policies [4]. Studies on the bioavailability of nutrients from traditional Indian foods are also warranted, as this information is crucial for accurately assessing the nutritional value of these foods and developing effective strategies to enhance nutrient absorption [8]. Developing culturally appropriate and sustainable dietary guidelines is crucial for promoting long-term nutritional well-being in India, taking into account the diverse dietary habits and socioeconomic conditions across different regions [1]. Understanding changes happening value due can help industry, researchers, consumers select suitable technique optimize value, increase bioavailability nutrients, combat [8].