HUMAN NUTRITION

Detailed explanation-1: -Food energy used to be measured in Calories (Cal) and some countries still use those units. The conversions are as follows: 1 kJ = 0.2 Cal. 1 Cal = 4.2 kJ.

Detailed explanation-2: -A calorie is a unit of measure of energy. Very specifically, it is the amount of energy that is required to raise the temperature of one mL, (which is also one gram), of water by one degree Celsius.

Detailed explanation-3: -A calorie is a unit that measures energy. Specifically, 1 calorie is the amount of energy it takes to raise the temperature of 1 gram of water by 1 degree Celsius. When it comes to calories and health, we’re talking about the amount of energy that our bodies can use from the foods and drinks we consume.

Detailed explanation-4: -Food energy is expressed in calories or joules. A calorie is the amount of energy required at one atmosphere of pressure to raise the temperature of 1 g of water from 14.5°C to 15.5°C (NRC, 1981).

Detailed explanation-5: -Food calorimetry allows us to determine the number of calories per gram of food. In this activity, a piece of food is burned and the released energy is used to heat a known quantity of water. The temperature change (∆T) of the water is then used to determine the amount of energy in the food.