The gross calorific value of proteins is

Gross calorific values of carbohydrates, proteins and fats are 4.1 kcal/g, 5.65 kcal/g and 9.45 kcal/g, respectively. The amount of heat liberated from complete combustion of 1 g food in bomb calorimeter is its gross calorific or gross energy value. The physiological values of carbohydrates, proteins and fats are 4.0 kcal/g, 4.0 kcal/g and 9.0 kcal/g, respectively.