Which one among the following is not a good source of nutritional calcium?

1. Basics of Human Nutrition: Macronutrients vs. Micronutrients (basic)

Welcome to your first step in mastering human nutrition! To understand how our bodies grow, repair themselves, and generate energy, we must first look at the nutrients we consume. Nutrition is not just about eating; it is the process of breaking down complex food components into simpler forms that our body can use Science-Class VII, Life Processes in Animals, p.122. These nutrients are broadly classified into two categories based on the quantity our body requires: Macronutrients and Micronutrients.

Macronutrients are the "big players" required in large amounts. They include Carbohydrates (our primary energy source), Proteins (the building blocks for growth and muscle repair), and Fats (for energy storage and protecting organs). For instance, foods like milk, curd, and paneer are excellent sources of both proteins and fats, which are essential for gaining strength and helping the body develop during critical stages like adolescence Science-Class VII, Adolescence: A Stage of Growth and Change, p.79.

Micronutrients, on the other hand, are required in much smaller, "trace" quantities, but they are equally vital. These include Vitamins and Minerals. Minerals like Calcium (found in millets and milk) are crucial for bone health, while Iron (found in spinach and green leafy vegetables) is indispensable for the formation of blood Science-Class VII, Adolescence: A Stage of Growth and Change, p.79. Even the organic acids found in our food, such as Citric acid in lemons or Lactic acid in curd, play roles in our overall chemistry Science, class X (NCERT 2025 ed.), Acids, Bases and Salts, p.28.

Here is a quick comparison to help you distinguish between them:

Feature	Macronutrients	Micronutrients
Quantity Needed	Large amounts (Grams)	Small amounts (Milligrams/Micrograms)
Main Function	Provide energy and structural growth	Regulate metabolism and prevent diseases
Examples	Carbohydrates, Proteins, Fats	Vitamins, Minerals (Iron, Calcium, etc.)

Sources: Science-Class VII, Life Processes in Animals, p.122; Science-Class VII, Adolescence: A Stage of Growth and Change, p.79; Science, class X (NCERT 2025 ed.), Acids, Bases and Salts, p.28

2. Role of Essential Minerals: Calcium and Phosphorus (basic)

To understand human nutrition, we must look beyond the energy-giving macronutrients (carbohydrates and fats) and focus on essential minerals like Calcium (Ca) and Phosphorus (P). These are known as macrominerals because the body requires them in relatively larger amounts compared to trace minerals like iodine or zinc. They are the primary building blocks of our skeletal system, providing the structural integrity that allows us to move and grow, especially during critical periods like adolescence Science-Class VII, Adolescence: A Stage of Growth and Change, p. 79.

While both minerals are stored primarily in our bones and teeth, they play distinct physiological roles. Calcium is vital for muscle contraction, blood clotting, and transmitting signals through the nervous system. In contrast, Phosphorus is a key component of ATP (the body's energy currency) and the structural framework of our DNA and cell membranes. The body maintains a delicate balance between these two; if Calcium levels are too low, the body may actually 'borrow' it from the bones, leading to weakness over time. For adolescents, a diet rich in these minerals is essential for reaching optimal bone density and supporting rapid growth Science-Class VII, Adolescence: A Stage of Growth and Change, p. 79.

When it comes to dietary sources, not all staples are created equal. For instance, polished white rice is a notoriously poor source of Calcium, often providing negligible amounts (as low as 1–10 mg per 100g) because the mineral-rich outer layers are removed during processing. To meet nutritional requirements, one must look toward millets (like Ragi), dairy products (milk, curd, paneer), and green leafy vegetables.

Mineral	Primary Functions	Rich Dietary Sources
Calcium (Ca)	Bone/teeth formation, blood clotting, muscle function.	Milk, Ragi (Finger Millet), Curd, Green Leafy Vegetables.
Phosphorus (P)	Energy production (ATP), DNA structure, bone health.	Meat, Fish, Beans, Whole Grains, Dairy.

Sources: Science-Class VII . NCERT(Revised ed 2025), Adolescence: A Stage of Growth and Change, p.79

3. Vitamin-Mineral Synergy: The Role of Vitamin D (intermediate)

Concept: Vitamin-Mineral Synergy: The Role of Vitamin D

4. Food Fortification and FSSAI Standards (intermediate)

Food Fortification is the process of deliberately increasing the content of essential micronutrients (vitamins and minerals) in food to improve its nutritional quality and provide a public health benefit with minimal risk to health. In India, this is a critical strategy to combat 'hidden hunger'—a condition where the diet provides enough calories but lacks vital nutrients. Common staples like rice, wheat, milk, and salt are 'fortified' to address widespread deficiencies in Iron, Vitamin B12, and Folic Acid. For example, while polished rice is a major staple, it is naturally low in certain minerals; fortification turns it into a powerful tool for nutritional security Indian Economy, Nitin Singhania, Agriculture, p.292.

The Food Safety and Standards Authority of India (FSSAI) is the apex regulatory body that governs these standards. Established under the Food Safety and Standards Act, 2006, FSSAI operates as an autonomous body under the Ministry of Health & Family Welfare Indian Economy, Nitin Singhania, Food Processing Industry in India, p.411. To help consumers identify fortified products, FSSAI introduced the +F logo. When you see this symbol on a food packet, it indicates that the product has been enriched with micronutrients according to the scientific standards laid down by the government.

Beyond just setting rules, FSSAI is responsible for a comprehensive safety ecosystem. Its mandate includes:

• Framing Regulations: Laying down the guidelines for food articles and enforcement systems.
• Certification: Setting mechanisms for certifying laboratories to ensure food safety management Indian Economy, Vivek Singh, Supply Chain and Food Processing Industry, p.374.
• Information Network: Providing reliable data to the public regarding contaminants and emerging food risks.

To support these standards, the government’s PM-SAMPADA scheme provides the necessary Food Safety and Quality Assurance Infrastructure. This infrastructure ensures that the fortification standards set by FSSAI are actually met by food processors through rigorous testing and preservation capacities Indian Economy, Vivek Singh, Supply Chain and Food Processing Industry, p.368.

Sources: Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025), Understanding Markets, p.269; Indian Economy, Nitin Singhania .(ed 2nd 2021-22), Food Processing Industry in India, p.411; Indian Economy, Vivek Singh (7th ed. 2023-24), Supply Chain and Food Processing Industry, p.374; Indian Economy, Nitin Singhania .(ed 2nd 2021-22), Agriculture, p.292; Indian Economy, Vivek Singh (7th ed. 2023-24), Supply Chain and Food Processing Industry, p.368

5. Millets (Shree Anna): The Nutri-Cereal Revolution (exam-level)

Many of us grew up hearing millets described as 'coarse grains,' a term that fails to capture their true value. Today, they are celebrated as Shree Anna or Nutri-cereals. Historically, millets were the first crops cultivated by humans even before the age of the plough Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.26. In India, they form a crucial part of our agricultural landscape, occupying about 54% of the total cropped area alongside other cereals INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, Land Resources and Agriculture, p.26. Unlike 'fine grains' like rice and wheat, millets are highly resilient, often grown as rain-fed crops in moist areas that require very little irrigation NCERT. (2022). Contemporary India II, The Age of Industrialisation, p.83. From a nutritional standpoint, millets are far superior to refined cereals. For example, while polished white rice provides negligible amounts of calcium (only about 1–10 mg per 100g), millets like Finger Millet (Ragi) are powerhouse sources, offering approximately 344–364 mg of calcium per 100g NCERT (Revised ed 2025), Science-Class VII, Chapter 6, p.79. This makes them indispensable for bone health and combating malnutrition. Beyond calcium, they are rich in iron, micro-nutrients, and roughage (dietary fiber), which aids digestion and metabolic health. To master this topic for the exam, you should distinguish between the two main categories based on seed size and cultivation extent:

Category	Examples	Key Characteristics
Major Millets	Sorghum (Jowar), Pearl Millet (Bajra), Finger Millet (Ragi)	Widely cultivated; Jowar is the 3rd most important food crop in India by area/production.
Minor Millets	Foxtail, Little, Kodo, Proso, and Barnyard millets	Smaller seeds; traditionally grown by local communities; high climate resilience.

Sources: Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.26; Environment, Shankar IAS Academy, Agriculture, p.353; Indian Economy, Nitin Singhania, Agriculture, p.339; INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII, Land Resources and Agriculture, p.26; NCERT. (2022). Contemporary India II, The Age of Industrialisation, p.83; NCERT (Revised ed 2025), Science-Class VII, Chapter 6: Adolescence: A Stage of Growth and Change, p.79

6. Comparative Nutritive Value of Staples and Animal Products (exam-level)

To understand human nutrition, we must distinguish between macronutrient quantity (calories/energy) and micronutrient density (vitamins/minerals). While staples like rice and wheat are the primary energy sources for the Indian population, their nutritive value varies drastically based on processing and variety. For instance, polished white rice is a very poor source of dietary calcium, containing only about 1–10 mg per 100g. This is because the milling process removes the husk and bran layers where most minerals reside. In contrast, millets—often called 'nutri-cereals'—are mineral powerhouses. Finger millet (Ragi) stands out as an exceptional plant-based source of calcium, providing roughly 344–364 mg per 100g, which is nearly thirty times more than polished rice Science-Class VII, NCERT (Revised 2025), Chapter 6, p. 79. Animal products offer a different nutritional profile, often characterized by higher bioavailability (the ease with which the body absorbs nutrients). Milk and skimmed milk are established dietary staples for calcium, essential for bone health during stages like adolescence Science-Class VII, NCERT (Revised 2025), Chapter 6, p. 79. Interestingly, the nutritional form of milk can be altered through biological processes. For example, the bacterium Lactobacillus ferments milk into curd by converting lactose sugar into lactic acid, which changes the pH and texture while preserving most mineral content Science, Class VIII, NCERT (Revised 2025), p. 22. While eggs are highly nutritious in terms of protein and fats, their calcium content (found mostly in the shell, but present in smaller amounts in the yolk/white) is still significantly higher than that of polished rice.

To compare these values effectively, look at the relative calcium content per 100g of edible portion:

Food Item	Approx. Calcium (mg/100g)	Nutritional Category
Polished White Rice	1 – 10 mg	Low Mineral Staple
Finger Millet (Ragi)	~344 – 364 mg	High Mineral Nutri-cereal
Milk	~120 mg	High Bioavailability Animal Product
Eggs	~50 mg	Moderate Mineral Animal Product

Sources: Science-Class VII, NCERT (Revised 2025), Chapter 6: Adolescence: A Stage of Growth and Change, p.79; Science, Class VIII, NCERT (Revised 2025), The Invisible Living World: Beyond Our Naked Eye, p.22

7. Solving the Original PYQ (exam-level)

You have just explored the essential role of micronutrients in human growth, particularly during critical developmental stages. This question tests your ability to apply those building blocks by distinguishing between staple calorie sources and nutrient-dense foods. While we often rely on cereals for daily energy, their mineral profiles vary drastically. As emphasized in Science-Class VII . NCERT (Revised ed 2025), meeting nutritional needs requires selecting foods specifically rich in minerals like calcium to support bone health and physiological functions.

To arrive at the correct answer, you must evaluate the calcium density of each food item. Ragi (finger millet) is a well-known "superfood" in the Indian diet, containing exceptionally high calcium levels (~364 mg/100g). Skimmed milk remains an excellent source because calcium is found in the non-fat solids of milk, meaning its removal doesn't deplete the mineral. Even eggs provide a respectable mineral profile alongside high-quality protein. In contrast, polished white rice is primarily composed of starch; the milling process removes the nutrient-rich outer layers, leaving a negligible 1–10 mg of calcium. Therefore, Rice is the clear outlier and the correct answer.

UPSC often incorporates common misconceptions as traps. For instance, many students mistakenly choose Skimmed milk, assuming that the removal of fat also removes minerals—this is a classic distractor. Another trap is assuming that because Rice is a dietary staple, it must be nutritionally complete. Always remember: a food can be a great source of macronutrients (energy) while being a very poor source of micronutrients (minerals). Identifying this distinction is key to mastering biology-based questions.