Foods that provide energy to the human body are fats, carbohydrates and proteins. Depending on the type of nutrients, the amount of fat, carbohydrate and protein in them varies. In other words, the energy values ​​of nutrients vary depending on the types and amounts of nutrients in its composition. The amount of energy supplied by the food is measured using the bomb calorimeter tool. The special place of this tool is to put the food to be calorie measured and burn it. With this heat, the water in the vehicle is heated and the temperature of the water is measured. 1 grams of fat give 9 calories, carbohydrate 4 calories, protein 6 calories. However, these values ​​are lower in the human body. Because foods burn completely, without loss of calorimeter. However, there are some losses in the human body. Not all the food entering the body can be digested. A very small portion is excreted without being burned. Therefore, taking into account the possible losses, a reduction is made in the energy values ​​measured in the calorimeter. Adjusted values ​​are the main amount of energy that nutrients provide to the body. This is called physiological energy value.

It has to be energy for all physical and chemical events that occur in the body. This energy is obtained by the release of energy, which is taken as nutrients, stored in foods such as fat, carbohydrate and protein by metabolism. This amount of energy is measured in calories to lose weight. The amount of heat needed to remove the heat of 1 grams of distilled water from 14,5 degrees to 15,5 is called 1 kilocalories.

Within the scope of chemical food analyzes, calorimetry and total energy amount determination studies are carried out in food, solid and liquid cooking oils, sugary foods, chocolate, halva, food additives, feed additives, powdered beverage, eggs, fish products and similar food products in the authorized laboratories.