The textbook corresponds to the program of the discipline “Healthy Lifestyle” for pedagogical universities. It examines the impact of the environment on human health. Particular attention is paid to maintaining health and the harmful effects of addictions such as smoking, as well as personality-destroying alcoholism and drug addiction. A significant place is occupied by the description of therapeutic nutrition. Practical recommendations are given for people with age-related diseases - hypertension, myocardial infarction, stroke, diabetes mellitus, eye diseases. The textbook is intended for students of pedagogical universities, medical workers, teachers of secondary schools, parents of schoolchildren and for a wide range of readers interested in maintaining health. 2nd ed., add. and correction