Alexander Sushansky is a doctor of medical sciences who has been relieving patients from digestive problems for more than 50 years. In the process of working with thousands of people, the author created a unique system - the theory of systemic nutrition, which will answer the three most important questions about food: what food to choose, how to consume it and in what volume. A comprehensive work on nutrition in an accessible language will tell about the structure of the digestive system and its vulnerabilities, about the basic principles of a healthy diet and about the program for the transition to a healthy diet. Eat right and be healthy!