Unit of thermal energy for humans is the amount of heat needed to raise the temperature of one kilogram of water from four Sntgrad degree to five degrees above zero Sntgrad. Has taken Calorie (calories) a measure of the strength of food. Caloric availability of energy needed by your body to stay alive. In food, there are calories in carbohydrates (Kalncha and sugar), and in the fats and proteins. The fat Vetofr more than twice the number of calories each gram compared to carbohydrates and proteins.
Thus, each gram of Alglikoz for example, may generate heat in the body equivalent to 3.74 calories and a gram of fat generates heat of $ 9.4 calories and one gram of starch generates 4.19.
Source of energy the energy value
One gram protein = four calories
One gram of carbohydrates = four calories
One gram fat = nine calories