Module 3 · CTET Environmental Studies / Science

Food, Nutrition & Health

Nutrition, food sources, diseases, hygiene, balanced diet.

Nutrition · Food Sources · Diseases · Hygiene · Balanced Diet

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Learning Objectives

Understand the fundamental concepts of Food, Nutrition & Health
Apply key formulas and techniques to solve problems
Practice with exam-level questions to build speed and accuracy

Key Concepts

Food, Nutrition and Health

Food and health form a crucial theme in EVS education. Children learn about the sources of food, its nutritional value, balanced diet, food habits, hygiene, and the relationship between food and health. This knowledge empowers children to make healthy food choices and develop good health practices from an early age.

Key Concepts

Sources of Food: Food comes from two primary sources - plants (fruits, vegetables, grains, pulses, nuts, oils, spices) and animals (milk, eggs, meat, fish, honey). Children should understand that different foods come from different parts of plants - roots (carrot, radish), stems (potato, ginger), leaves (spinach, cabbage), flowers (cauliflower, broccoli), fruits (apple, mango), and seeds (rice, wheat, pulses). Also important is understanding food chains and the difference between herbivores, carnivores, and omnivores.

Food Groups and Nutrients: Major nutrients include Carbohydrates (energy giving - rice, wheat, bread, potato, sugar), Proteins (body building - pulses, milk, eggs, meat, fish, soybeans), Fats (energy storage, insulation - butter, oil, ghee, nuts), Vitamins (protective - fruits, vegetables), and Minerals (protective - green leafy vegetables, milk, eggs). Water and dietary fiber (roughage) are also essential. Each nutrient has specific functions and deficiency causes specific diseases.

Balanced Diet and Nutritional Deficiencies: A balanced diet contains all nutrients in correct proportions. Deficiency diseases: Vitamin A deficiency causes night blindness; Vitamin B1 causes beriberi; Vitamin C causes scurvy; Vitamin D causes rickets (bone deformities); Iron deficiency causes anemia (weakness, fatigue); Iodine deficiency causes goiter (thyroid swelling); Calcium deficiency affects bone and teeth health. The Mid-Day Meal Scheme in Indian schools aims to address malnutrition among children.

Food Hygiene and Safety: Importance of clean drinking water (boiling/filtering), washing hands before eating, washing fruits and vegetables, proper food storage (refrigeration for perishables, dry storage for grains), checking expiry dates, and avoiding street food from unhygienic sources. Food spoilage due to bacteria, fungi, and insects can cause food poisoning. Preservation methods include drying, refrigeration, pickling, canning, and adding preservatives.

Health and Diseases: Health is a state of complete physical, mental, and social well-being (WHO definition). Diseases are classified as Communicable (infectious - spread from person to person - cold, flu, chickenpox, COVID-19, tuberculosis, diarrhoea) and Non-communicable (non-infectious - diabetes, hypertension, asthma, allergies). Prevention through vaccination, hygiene practices, and healthy lifestyle. Personal hygiene includes regular bathing, oral care (brushing teeth), hand washing, and clean clothing.

Solved Examples

Example 1

Which nutrient is primarily responsible for providing energy to the body?

a) Proteins b) Vitamins c) Carbohydrates d) Minerals

Solution: c) Carbohydrates. Carbohydrates are the body's main source of energy. They are broken down into glucose, which is used by cells for energy. Rice, wheat, bread, and potatoes are rich sources of carbohydrates. Proteins are for growth and repair, vitamins and minerals protect the body from diseases, and fats provide stored energy and insulation.

Example 2

A child has difficulty seeing in dim light. Which vitamin deficiency is likely responsible?

a) Vitamin B1 b) Vitamin C c) Vitamin A d) Vitamin D

Solution: c) Vitamin A. Night blindness (difficulty seeing in low light) is caused by Vitamin A deficiency. Vitamin A is essential for healthy vision, especially for the retina to adjust to changes in light levels. Rich sources of Vitamin A include carrots, papaya, mango, milk, eggs, and green leafy vegetables. Vitamin D deficiency causes rickets, and Vitamin C deficiency causes scurvy.

Example 3

Which of the following is a communicable disease?

a) Diabetes b) Hypertension c) Chickenpox d) Asthma

Solution: c) Chickenpox. Chickenpox is a highly contagious viral infection that spreads through direct contact or airborne droplets. It is communicable (can spread from person to person). Diabetes, hypertension, and asthma are non-communicable diseases caused by genetic, lifestyle, or environmental factors and cannot spread from person to person.

Shortcut Techniques

Nutrient Functions - 4 simple rules: Carbo = Energy (fuel), Protein = Building (repair/growth), Fat = Storage (extra energy), Vitamins/Minerals = Protection (immunity). Think: Car = Fast fuel, Pro = Building blocks, Fat = Reserve tank, V&M = Bodyguards.
Deficiency Diseases - Vitamin ABC: A=Night blindness, B1=Beriberi, C=Scurvy, D=Rickets. For minerals: Iron=Anemia, Iodine=Goiter, Calcium=Bones. Mnemonic: 'All Boys Can Dance' - A, B, C, D.
Communicable vs Non-communicable: Communicable = Contagious (spreads through Contact). Non-communicable = Not spreading (internal causes). Think: C = Contact spreads, N = Not contagious.
Food Sources - Plant Parts: Root (under), Stem (modified), Leaf (green tops), Flower (floral), Fruit (pulpy), Seed (grains). Think: R-S-L-F-F-S - Roots, Stems, Leaves, Flowers, Fruits, Seeds.

Pro Tip

For CTET EVS, connect food and health topics to children's daily experiences. Ask them about what they ate for breakfast, or what foods are commonly cooked in their homes. Relate balanced diet concepts to familiar meals (dal-rice-vegetable, roti-sabzi-dal). This makes learning contextual and meaningful.

Integrated Approach

EVS covers science, social studies, and environment. Master connections: Water connects to sources (Science), conservation (Environment), purification (Health), transport (Travel), harvesting (Social Studies).

Pro Tip

For CTET, EVS questions test application of pedagogical principles. Choose child-centered, experiential approaches per NCF 2005.

Integrated Approach

Pro Tip

For CTET, EVS questions test application of pedagogical principles. Choose child-centered, experiential approaches per NCF 2005.

Integrated Approach

Pro Tip

For CTET, EVS questions test application of pedagogical principles. Choose child-centered, experiential approaches per NCF 2005.

Integrated Approach

Pro Tip

For CTET, EVS questions test application of pedagogical principles. Choose child-centered, experiential approaches per NCF 2005.

Practice Questions

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