Food

Sources of Food, Balanced Diet and Food Preservation

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Overview

Food is a foundational topic in Environmental Studies for MP TET Varg-3 (Primary Level). It connects children's everyday experiences with scientific concepts about nutrition, health, and the environment. Questions typically test knowledge of food sources (plant vs animal), components of a balanced diet, nutrient functions, and methods of food preservation.

This topic integrates well with other EVS themes like plants, animals, health, and local resources of Madhya Pradesh. Expect direct factual questions as well as application-based items where you must identify deficiency diseases, classify foods into groups, or suggest preservation methods. Mastery here also helps with pedagogy questions on activity-based learning using local food examples.

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Key Concepts

• **Two main sources of food**: Plants (cereals, pulses, vegetables, fruits, oils, spices) and Animals (milk, eggs, meat, fish, honey).

• **Food components (nutrients)**: Carbohydrates, proteins, fats, vitamins, minerals, water, and roughage (dietary fibre) — each serves a specific body function.

• **Energy-giving foods**: Carbohydrates (rice, wheat, potato) and fats (oil, ghee, butter) provide energy measured in calories.

• **Body-building foods**: Proteins (dal, milk, eggs, fish, soybean) help in growth and repair of body tissues.

• **Protective foods**: Vitamins and minerals (found in fruits, vegetables, milk) protect against diseases and regulate body processes.

• **Balanced diet**: A diet that contains all nutrients in the right proportion, along with adequate water and roughage, suited to age, gender, and activity level.

• **Food preservation**: Methods to prevent spoilage by microorganisms — includes traditional (drying, salting, pickling) and modern (refrigeration, pasteurisation, canning) techniques.

• **Local context (MP)**: Madhya Pradesh is a major producer of wheat, soybean, pulses (chana, masoor), and oilseeds — important for connecting syllabus to regional examples.

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Formulas / Key Facts

| Nutrient | Main Sources | Function | Deficiency Disease | |----------|--------------|----------|-------------------| | Carbohydrates | Rice, wheat, potato, sugar | Energy | Weakness, fatigue | | Proteins | Pulses, milk, eggs, fish, soybean | Growth and repair | Kwashiorkor, Marasmus | | Fats | Ghee, butter, oil, nuts | Energy storage, warmth | Weight loss, dry skin | | Vitamin A | Carrot, papaya, milk, liver | Good eyesight, healthy skin | Night blindness | | Vitamin B complex | Whole grains, eggs, meat | Metabolism, nerve function | Beriberi, Pellagra | | Vitamin C | Citrus fruits, amla, guava | Immunity, wound healing | Scurvy | | Vitamin D | Sunlight, fish, egg yolk | Strong bones and teeth | Rickets (children), Osteomalacia (adults) | | Calcium | Milk, cheese, green leafy vegetables | Bones, teeth, muscle function | Weak bones, tooth decay | | Iron | Spinach, jaggery, meat, dates | Haemoglobin formation | Anaemia | | Iodine | Iodised salt, seafood | Thyroid function | Goitre |