Human energy demand

For all nature, the sun is the sunny source of energy. The energy of it, gathered in organic compounds produced in plants, It is indirectly transferred to animals and people. Vegetarianism is therefore, by removing the indirect stage of transmitting solar energy to the human body through an animal, The simplest and best method of using this energy.

The energy is expressed in the jules (J) Although we use a traditional unit in science of nutrition, which is calorie. So -called. large calorie (Kcal) This is the amount of heat needed to heat 1 kg of water by 1 ° C (strictly from 14.5 ° C to 15.5 ° C)

Depending on the age of man, his lifestyle and a number of other factors can be at all levels.

Covering these needs is only possible by intermediate changes, what nutrients succumb to in the body, mainly carbohydrates, fats and proteins. Human metabolism in various physiological conditions and e.g.. professional or other activity, You can measure. We will skip the measurement methods here, giving only, that the concept of basic metabolism p.p.. connects with such a state, when the body is in total physical and mental peace. It is a state, in which man does not move, It is on an empty stomach, nor hot. The basic metabolism serves as an indicator of the proper functioning of the body, So health. For the ease of remembering, we accept, that a healthy man has p.p.. at the level 1 kcal during 1 time. na 1 kg body weight. Calculation of p.p.. It is very simple with this assumption, It is enough to multiply the weight of the body by 24 and we will receive a daily p.p.. This calculation differs significantly from the real value, when we would like to apply them to children. Children usually have a much higher metabolism.

For easier orientation in energy expenses related to the performance of various activities, a table has been presented 2.

Table 2

Energy expenses in kcal/h in an adult man with a mass 70 kg
performing various activities (round)