In the etymology of the word nutrition, it comes from the Latin meaning “to give food, maintenance, supply with what it needs to act”, with its lexical components that are “nutrire” means “to nourish” and the prefix “cion” means ” action and effect. Nutrition is the main thing that initiates the knowledge by which the body takes nutrients from food through a series of unconscious phenomena such as nutrition, the impregnation of nutrients from food into the blood through the digestive tract and the digestion of the same by the cells of the organisms, maintaining the homeostatic balance of the organisms at the molecular and macrosystemic level.

Nutrition is the biological knowledge in which organisms digest food and liquids for the functioning, growth and maintenance of their vital performances. It is also the study of the link between food and health, especially when dieting.

The development of the macrosystems that is linked to the implementation, such as digestion, which is the process of variation of the food that is ingested, in the easiest elements to impregnate.

In metabolism, they are biochemical reactions and physical-chemical processes that occur in a cell and in the organism in which the interrelated process is the basis of life on a molecular scale, which are what allow the different activities of the microscopic unit of living beings. , in which they can grow, reproduce, among others.

Excretion is the physiological process that allows the body to eliminate waste elements that are harmful to the body and thus be able to maintain the balance of the composition of blood and other organic fluids.