1. The document discusses nutrition and calorie requirements. Different foods have different calorific values based on their chemical energy content, which is measured in calories or kilocalories. 2. The calorific value of food is determined by measuring the energy released when the food is completely burned, often using a bomb calorimeter. 3. A person's calorie requirements depend on physical activity, body size, age, sex, health, and temperature - with larger bodies and younger people typically needing more calories.

1. Chapter 2 ( Part 1 ) - Nutrition

4. 2.1 – The importance oftaking good nutrition & practising goodeating habits

6. The different classes of food shown in Photograph 2.1 contain different amounts of stored chemical energy.

7. The amount of chemical energy stored in food is called its calorific value.

8. Calorific value is usually measured in calories (cal) or kilocalories (kcal)

9. The calorific value of food is determined by measuring the amount of energy released when 1 g of the food is completely burnt.

10. An instrument which is commonly used to measure the calorific value of food is the bomb calorimeter shown in Photograph 2.2 and Figure 2.1.

18. Factors that Affect Our Calorie Requirementsdepend - physical activities

19. body size

20. age

21. sex

22. state of health

23. temperature of the surroundings

26. The body size of a person depends on the number of cells in the person's body. When the number of cells in the body increases, the body size gets bigger. As every body cell requires energy to function properly and stay alive, a person with a larger body size will have a higher calorie requirement.

28. Children and teenagers need more energy than adults.

29. This is because children and teenagers undergo rapid growth and have high metabolic rates.

30. When adults get older, they stop growing and their metabolic rates drop.

65. E.C.G I.C.U

66. Life and death