A calorie is the more of heat required to raise the temperature 1 degree in 1 kg of water. Carbohydrates, proteins and fats are the main nutrients in food that provide energy to the body.
Proteins and carbohydrates are 4 calories per gram, while fats have 9 calories per gram.
The calories that are not used in the expenditure of energy is stored in the body as fat
Daily calories (per day) burned tissue kilo: