BharatNotes Why this chapter matters for UPSC: Nutrition and deficiency diseases directly link to public health policy (GS2) — POSHAN Abhiyaan, Anaemia Mukt Bharat, mid-day meals, food fortification. India's malnutrition burden is one of the largest in the world and is a recurring UPSC topic.
PART 1 — Quick Reference Tables
Nutrients — Functions and Sources
| Nutrient | Function | Main Food Sources |
|---|---|---|
| Carbohydrates | Energy (4 kcal/g); main fuel for body | Rice, wheat, maize, potato, sugar |
| Proteins | Body building; repair; enzymes, antibodies | Dal, eggs, meat, fish, milk, soybean |
| Fats | Energy reserve (9 kcal/g); fat-soluble vitamins; insulation | Butter, ghee, oil, nuts, meat |
| Vitamins | Regulate body functions; protect from disease | Fruits, vegetables, milk, eggs |
| Minerals | Bone/teeth formation; nerve function; blood | Milk (Ca), spinach (Fe), iodised salt (I) |
| Water | Transport nutrients; regulate temperature; 60-70% of body | Water, all food contains water |
| Roughage (Dietary Fibre) | Aids digestion; prevents constipation; no nutritional value | Whole grains, vegetables, fruits |
Vitamins — Types, Sources, Deficiency Diseases
| Vitamin | Type | Key Sources | Deficiency Disease |
|---|---|---|---|
| A (Retinol) | Fat-soluble | Carrot, papaya, mango, milk, liver | Night blindness; Xerophthalmia |
| B1 (Thiamine) | Water-soluble | Whole grains, nuts, legumes | Beriberi (nerve/heart) |
| B2 (Riboflavin) | Water-soluble | Milk, eggs, leafy vegetables | Cracked lips, skin rashes |
| B3 (Niacin) | Water-soluble | Meat, groundnuts, whole grains | Pellagra (3 Ds: Dermatitis, Diarrhoea, Dementia) |
| B12 | Water-soluble | Meat, fish, dairy (not found in plants) | Anaemia; nerve damage; risk for strict vegans |
| C (Ascorbic acid) | Water-soluble | Amla (highest), citrus, guava, tomato | Scurvy (bleeding gums, weak bones) |
| D (Calciferol) | Fat-soluble | Sunlight (skin synthesis), fish liver oil, fortified milk | Rickets (children), Osteomalacia (adults) |
| K | Fat-soluble | Green leafy vegetables, liver | Impaired blood clotting |
Minerals — Key Examples
| Mineral | Function | Sources | Deficiency |
|---|---|---|---|
| Calcium (Ca) | Bones, teeth, muscles | Milk, ragi, sesame | Rickets, osteoporosis |
| Iron (Fe) | Haemoglobin (carries oxygen) | Spinach, jaggery, liver, dried fruits | Anaemia — India's biggest micronutrient deficiency |
| Iodine (I) | Thyroid hormone production | Iodised salt, seafood | Goitre; cretinism in newborns |
| Phosphorus | Bones, teeth, DNA | Meat, fish, dairy, legumes | Weakness, bone pain |
| Zinc | Immune function, growth | Meat, seeds, legumes | Growth retardation, poor immunity |
PART 2 — Detailed Notes
Balanced Diet
Balanced Diet: A diet that contains all essential nutrients — carbohydrates, proteins, fats, vitamins, minerals, water, and roughage — in the right proportions needed for good health, growth, and body function.
The composition varies by age, gender, activity level, and physiological state (pregnant women need more iron and folic acid; growing children need more protein and calcium).
ICMR-NIN Recommended Dietary Allowances (RDA): The Indian Council of Medical Research's National Institute of Nutrition publishes dietary guidelines for different population groups in India.
Malnutrition in India
UPSC GS2 — India's malnutrition burden:
India has one of the highest malnutrition burdens in the world despite being a major food producer. This paradox is called the "paradox of plenty" — food is produced but not reaching or being absorbed by all.
Key data (NFHS-5, 2019-21):
- Stunting (low height-for-age): 35.5% of children under 5
- Wasting (low weight-for-height): 19.3% of children under 5
- Underweight (low weight-for-age): 32.1% of children under 5
- Anaemia in women (15–49 years): 57% — extremely high
- Anaemia in children (6–59 months): 67.1%
Why high anaemia? Iron deficiency is the most common micronutrient deficiency in India — driven by low consumption of iron-rich foods, poor iron absorption (phytates in cereals block absorption), and low Vitamin C intake.
Government schemes to address malnutrition:
- POSHAN Abhiyaan / Mission POSHAN 2.0 (launched 2018): Target to reduce stunting, underweight, anaemia, and low birth weight; integrates 9 ministries; uses Poshan Tracker app for real-time monitoring. [Additional] Budget: ₹20,263 crore (FY2024-25).
- Anaemia Mukt Bharat (AMB): 6×6×6 strategy targeting 6 beneficiary groups with 6 interventions through 6 mechanisms; goal of 3 percentage-point reduction per year in anaemia prevalence. [Additional] Budget: ₹805.91 crore (FY2024-25).
- PM POSHAN (formerly Mid-Day Meal Scheme): School meals for ~11.8 crore children in 11.2 lakh schools; provides protein, calories, micronutrients
- Supplementary Nutrition Programme (SNP): Through Anganwadi centres (ICDS); for children 0–6 years and pregnant/lactating women
- Food Fortification: Adding micronutrients to staple foods — fortified rice (iron, folic acid, B12) under PMGKAY and PDS; Universal Salt Iodisation made a national goal in 1983; legally mandated in 1998 under the Prevention of Food Adulteration Act 1954 (ban on non-iodised salt reinstated in 2005)
Important Deficiency Diseases — Detail
Rickets vs Scurvy (commonly confused):
- Rickets: Vitamin D deficiency → calcium not absorbed properly → soft, deformed bones in children (bow legs, skull deformities)
- Scurvy: Vitamin C deficiency → collagen synthesis fails → bleeding gums, loose teeth, poor wound healing; historically killed sailors on long voyages (no fresh food)
Beriberi:
- Vitamin B1 (Thiamine) deficiency
- Two types: Wet beriberi (heart failure, oedema) and Dry beriberi (nerve damage, muscle weakness)
- Historic association with polished white rice diets (milling removes the thiamine-rich bran)
Night Blindness:
- Vitamin A deficiency → rod cells in retina can't function properly in low light
- India: Vitamin A deficiency is significant in children; National Vitamin A Programme provides megadose Vitamin A capsules to children aged 9 months to 5 years
Goitre:
- Iodine deficiency → thyroid gland enlarges trying to produce more thyroid hormone
- Iodine Deficiency Disorders (IDD): Goitre, cretinism (intellectual disability in newborns of iodine-deficient mothers), hypothyroidism
- India's response: Universal Salt Iodisation — all edible salt must be iodised under Prevention of Food Adulteration Act and FSSAI regulations
[Additional] 2a. Complete vs Incomplete Proteins — Why Combining Foods Matters
The chapter lists protein sources but does not explain a critical distinction: not all proteins are equal. The building blocks of proteins are amino acids. Of the 20 amino acids, 9 are "essential" — the human body cannot make them; they must come from food.
Complete protein: Contains all 9 essential amino acids in adequate amounts.
- Sources: Eggs, milk, meat, fish, soya bean (the only plant with complete protein)
Incomplete protein: Missing or low in one or more essential amino acids.
- Sources: Most plant proteins — dal, wheat, rice, groundnut
Why this matters for India: India has one of the world's highest rates of vegetarianism (~30–40% of population). Vegetarian diets risk protein deficiency if not carefully combined — but traditional Indian food combinations already solve this problem:
| Traditional Combination | Why It Works |
|---|---|
| Dal + Rice (dal chawal) | Dal is rich in lysine (low in rice); rice is rich in methionine (low in dal) — together = complete protein |
| Rajma + Roti (rajma chawal) | Kidney beans + wheat together provide all essential amino acids |
| Idli/Dosa (urad dal + rice) | Fermented combination achieves protein complementation |
| Milk + Wheat (roti with milk) | Milk's complete protein fills gaps in wheat's incomplete protein |
UPSC relevance: Kwashiorkor — severe protein deficiency disease in children — occurs NOT because of total food shortage but because of low-quality protein intake (starchy diets lacking essential amino acids). This is different from Marasmus (total calorie + protein deficiency = starvation). Both are forms of Protein-Energy Malnutrition (PEM).
[Additional] 2b. Nutrient Interactions — How Nutrients Work Together
The chapter treats each nutrient in isolation. A critical gap: nutrients interact with each other and with food components in ways that determine whether they are actually absorbed by the body.
Key interactions (all verified, peer-reviewed science):
1. Vitamin C + Iron → Better Absorption
- Plant-based iron (non-haem iron from spinach, dal, jaggery) is poorly absorbed — only 2–5% absorbed vs 15–35% for haem iron (from meat)
- Vitamin C (ascorbic acid) converts Fe³⁺ (ferric) to Fe²⁺ (ferrous) — the form the gut absorbs. Vitamin C also forms a soluble complex with iron that prevents phytic acid from blocking absorption
- Practical implication: Eating spinach with lemon juice, or dal with amla/tomato/citrus, dramatically increases iron absorption. Drinking tea/coffee with meals (tannins bind iron) reduces absorption
- National significance: India's 57% anaemia rate in women (NFHS-5) could be significantly improved by this simple dietary pairing — without additional food cost
2. Vitamin D + Calcium → Bone Formation
- Calcium cannot be absorbed from the gut without Vitamin D. The chapter says calcium builds bones — but omits that Vitamin D is the gatekeeper for calcium absorption
- Vitamin D deficiency = Rickets even if calcium intake is normal
- India has paradoxically high Vitamin D deficiency despite abundant sunshine — urban populations avoid sun exposure; dark skin requires more sun for Vitamin D synthesis
3. Fat + Fat-Soluble Vitamins (A, D, E, K)
- Vitamins A, D, E, K are fat-soluble — they dissolve only in fat and are absorbed with dietary fat
- Eating carrots (Vitamin A source) with zero fat means very poor Vitamin A absorption
- This is why traditional Indian cooking (sabzi cooked in oil/ghee) is nutritionally correct — the fat enables fat-soluble vitamin absorption
- Policy implication: Fat-free or ultra-low-fat diets can cause fat-soluble vitamin deficiencies
4. Tea/Coffee + Iron → Inhibition
- Tannins in tea, oxalates in spinach, and phytates in cereals all inhibit iron absorption
- Drinking tea with meals is common across India — this is a major contributor to India's high anaemia rates alongside low intake
[Additional] Double Burden of Malnutrition — GS2 (Health Policy):
India is no longer facing only undernutrition. It now faces a "double burden" — undernutrition (stunting, wasting, anaemia) and over-nutrition (overweight, obesity) coexisting in the same population, often in the same household.
NFHS-5 (2019-21) data:
- Overweight/obese women (15–49 years): 24.0% — up from 12.6% in NFHS-3 (2005-06); a 91% increase
- Overweight/obese men (15–49 years): 22.9% — up from 9.3%; a 146% increase
- Overweight children under 5: 3.4% (up 127% from NFHS-3)
- Simultaneous: 35.5% children stunted, 57% women anaemic
Why does this happen?
- Rapid urbanisation → sedentary lifestyles + calorie-dense processed foods
- Dietary transition: shift from coarse grains to polished rice/maida, sugary beverages, ultra-processed foods
- The same household may have an anaemic mother (iron-deficient) and an overweight child (excess calories, nutritional void foods)
Disease consequences of obesity in India:
- India has the 3rd largest diabetes burden globally — ~101 million diabetics (ICMR-INDIAB study, 2023); Indians develop Type 2 diabetes at lower BMI than Western populations (metabolic obesity)
- Rising rates of hypertension, NAFLD (non-alcoholic fatty liver disease), PCOS
- Non-communicable diseases (NCDs) now account for ~60% of deaths in India
Policy gap: Government programmes (POSHAN Abhiyaan, ICDS) focus almost entirely on undernutrition — obesity and over-nutrition have no equivalent flagship programme. The National Multisectoral Action Plan for Prevention and Control of NCDs (2017-22) addresses lifestyle diseases but lacks the scale of nutrition-specific programmes.
[Additional] 2c. FSSAI and Food Safety — Regulating What We Eat
The chapter covers what nutrients food contains but not how India regulates food safety and quality — a direct UPSC GS2 topic.
[Additional] FSSAI — Food Safety and Standards Authority of India (GS2):
FSSAI is India's apex food regulatory body, established under the Food Safety and Standards Act 2006 (FSSA 2006). It replaced multiple earlier Acts (Prevention of Food Adulteration Act 1954, etc.) with a single comprehensive framework.
What FSSAI does:
- Sets standards for food products (maximum permissible levels of additives, contaminants, pesticide residues)
- Licenses food businesses (restaurants, manufacturers, importers)
- Regulates food labelling — what must appear on packages
- Conducts food safety surveillance and testing
Key labelling requirements (mandatory on packaged food):
- Product name, ingredients list (descending order by weight)
- Net quantity, date of manufacture, best before/use by date
- Nutritional information per 100g/100ml (energy, protein, carbs, fat, sodium)
- FSSAI licence number, manufacturer details
- Vegetarian/non-vegetarian symbol (green dot = veg; brown/red dot = non-veg) — India-specific requirement
2024 labelling amendment (July 6, 2024): FSSAI approved mandatory display of total sugar, salt, and saturated fat in bold and larger font on packaged food labels — making high-sugar/high-sodium products visually prominent to consumers.
Front-of-Pack (FoP) Labelling debate: FSSAI has proposed the "Indian Nutrition Rating" (INR) — a star rating system (0–5 stars) on the front of packets indicating overall nutritional health. Industry opposes it; public health groups support it. The draft regulation is under consideration (as of 2026). Similar systems are in place in Australia (Health Star Rating), UK (Traffic Light labelling).
Prelims distinction: FSSAI is a statutory body under MoH&FW (Ministry of Health and Family Welfare) — NOT a constitutional body. It is different from BIS (Bureau of Indian Standards, under DPIIT) which sets quality standards for industrial/consumer products.
Exam Strategy
Prelims traps:
- Night blindness = Vitamin A (NOT D or C)
- Scurvy = Vitamin C (NOT A or D)
- Rickets = Vitamin D (NOT calcium alone — it's calcium absorption that fails without D)
- Beriberi = Vitamin B1 (NOT B12)
- Pellagra = Vitamin B3 (Niacin) — three Ds: Dermatitis, Diarrhoea, Dementia
- Amla (Indian gooseberry) has the highest Vitamin C content among common foods — higher than citrus
- Vitamin B12 is found ONLY in animal products — strict vegans need supplementation
- Anaemia Mukt Bharat targets anaemia from iron deficiency (not all types of anaemia)
Mains connections:
- Malnutrition despite food surplus → failures of food distribution, absorption poverty
- POSHAN Abhiyaan + Jan Andolan approach
- Food fortification as a cost-effective policy
Practice Questions
Prelims:
Which vitamin deficiency causes night blindness?
(a) Vitamin A
(b) Vitamin B
(c) Vitamin C
(d) Vitamin DScurvy is caused by the deficiency of:
(a) Vitamin A
(b) Vitamin D
(c) Vitamin C
(d) Vitamin KWhich of the following has the highest Vitamin C content?
(a) Lemon
(b) Orange
(c) Amla (Indian gooseberry)
(d) GuavaIndia's POSHAN Abhiyaan primarily targets:
(a) Food production increase
(b) Reduction of malnutrition — stunting, wasting, anaemia
(c) Organic farming promotion
(d) Water purification
Mains:
- India faces a paradox of high food production alongside high malnutrition. Discuss the causes and the government's policy response. (GS2, 10 marks)
