When the "trees were big," and we were small children, there were no chips, hot dogs, cola and other unhealthy dishes and drinks. Children's nutrition was not as diverse as it is today, but gastritis, obesity, diabetes mellitus and allergies were rare. It was in the USSR that the best ratio of proteins, fats and carbohydrates for a children's diet was first selected and the daily nutrient demand of children of different ages was determined.