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Calorie is a unit of measurement, but it does not measure weight or length. The amount of energy released by the breakdown of complex food substances in the body is known as calorie. Calorie is directly proportional to energy , and this energy that is obtained through the breakdown of food materials helps the body to perform all the functions. If we intake more calories than the body needs, the extra calories are stored as fats. 1. Scientists use a bomb calorimeter to measure a food calorific value. Process - Calorific value is measured by the heat obtained from the sample. To measure the calorific value, the food is placed in a container surrounded by water and heated until the food is completely burned off. The rise in water temperature is recorded to determine the number of calories present in the food. 2. One calorie is the amount of heat that raises the temperature of water by 1 degree Celsius and the sum total of these consumed by humans is known as one's energy intake. 3. Energy output is the amount of energy expended on (1) metabolism; (2) physical activity; and (3) digestion, absorption and food poisoning. 4. In order to lose weight, one's energy intake should not exceed energy output, The energy output should be more as the extra calorie which is stored in the form of fat should be released in the form of sweat. 5. In order to lose weight, one's energy output must exceed energy intake. The energy output should be more as the extra calorie which is stored in the form of fat should be released in the form of sweat. 6. In order to gain weight, one's energy intake must exceed energy output. In order to gain weight more calorie should be utilized and stored in the form of fat in thebody.