The authors consider nutritional theoretical concepts in the light of the organizational possibilities of their use in modern pediatric practice. Analysis of nutrition problems in an evolutionary aspect implies taking into account the latest achievements in molecular biology, microbiology and biotechnology. As the most important part of medicine and health care, nutrition determines the relationship of a person with the internal and external world and is the basis for the formation of the health of a growing organism. The article discusses the general problems of qualitative and quantitative changes in nutritional parameters during the formation of diseases, their prevention and treatment.