Science: Class 6 — Chapter 3: Mindful Eating: A Path to a Healthy Body

3.1 Food Diversity and Culinary Practices

3.1.1 Regional Food Diversity

Regional Variation: Food habits across India vary based on locally grown crops, soil types, climate, and cultural traditions.
Crop-Food Link: Traditional dishes are typically based on locally cultivated crops (e.g., wheat and maize in Punjab, rice and ragi in Karnataka).

3.1.2 Evolution of Cooking Practices

Traditional Tools: Cooking was historically done using a chulha (traditional clay stove) and grinding was done manually with a sil-batta (stone grinder).
Modern Tools: Technological advancements have replaced these with modern gas stoves and electrical grinders for efficiency and ease.

3.2 Components of Food (Nutrients)

3.2.1 Energy-Giving Foods

Carbohydrates: Primary source of instant energy. Found in cereals (wheat, rice, maize), potatoes, sweet potatoes, and fruits (banana, mango, sugarcane). Glucose is a simple carbohydrate providing immediate energy.
Fats: Act as stored energy reserves and help keep the body warm. Sources include nuts (groundnuts, almonds), seeds, ghee, butter, and oils.

3.2.2 Body-Building Foods

Proteins: Essential for growth and tissue repair. Plant sources include pulses (moong, tuar dal, gram), beans, and soya beans. Animal sources include milk, paneer, eggs, fish, and meat. Edible mushrooms are also rich in protein.

3.2.3 Protective Nutrients (Vitamins and Minerals)

Vitamins & Minerals: Required in small quantities to protect the body from diseases and maintain health.
Key Vitamins & Minerals Table:

Nutrient	Function	Sources	Deficiency Disease & Symptoms
Vitamin A	Healthy eyes and skin	Papaya, carrot, mango, milk	Loss of vision (night blindness)
Vitamin B₁	Heart and nerve function	Legumes, nuts, whole grains	Beriberi (weak muscles, breathing trouble)
Vitamin C	Fights diseases	Amla, citrus fruits, green chilli	Scurvy (bleeding gums, slow wound healing)
Vitamin D	Calcium absorption	Sunlight, milk, fish, eggs	Rickets (soft and bent bones)
Calcium	Bone and teeth strength	Milk, curd, paneer	Bone and tooth decay (weak bones)
Iodine	Physical & mental growth	Iodised salt, seaweed	Goitre (swollen neck gland)
Iron	Blood formation	Green leafy vegetables, beetroot	Anaemia (weakness, fatigue)

3.2.4 Dietary Fibres and Water

Dietary Fibres (Roughage): Plant-based components (whole grains, pulses, fruits, vegetables) that do not provide nutrients but aid in digestion and smooth bowel movements.
Water: Essential for nutrient absorption and waste elimination (urine and sweat).

3.3 Chemical Tests for Nutrients

3.3.1 Nutrient Detection Methods

Starch Test: Add 2–3 drops of diluted iodine solution to the food. A blue-black colour indicates the presence of starch.
Fat Test: Rub the food item on a clean piece of paper. A translucent, oily patch indicates the presence of fat.
Protein Test: Mash the food, add water, then add 2 drops of copper sulfate solution and 10 drops of caustic soda solution. A violet colour indicates the presence of protein.

3.4 Balanced Diet and Modern Nutrition

3.4.1 Balanced Diet

Balanced Diet: A diet containing all essential nutrients, roughage, and water in the correct proportions for proper growth and development. Requirements vary by age, gender, and physical activity.
Junk Food: Foods high in calories, sugar, and fat but low in essential nutrients. Frequent consumption leads to obesity and health issues.

3.4.2 Millets (Nutri-cereals)

Millets: Highly nutritious, climate-resilient native crops of India (e.g., jowar, bajra, ragi, sanwa). Rich in minerals, vitamins, and dietary fibres.

3.4.3 Food Miles

Food Miles: The distance food travels from the producer to the consumer. Minimising food miles by eating locally grown food reduces transport costs, cuts pollution, and supports local farmers.