Introduction. Currently, adolescents and children commits numerous nutritional errors. These include: excessive consumption of food, increased consumption of sweet drinks, frequent and hearty meals, easy purchase of ready-to-eat food fast food with a high fat content, limitation of vegetable and fruit intake, and increased consumption of sweets. In Poland, overweight and obesity affect over 12% of children and youth in school age. Aim. The aim of the article is to present the diet of high school students in Cieszyn. Material and methods. The research material was collected in January 2018. The author's questionnaire entitled "My health - I care for him" was used for the work. An anonymous questionnaire contained several questions about diet, forms of spending free time and participation in physical education classes at school. The questionnaire was targeted at third grade high school students (189 boys and 178 girls). Based on the calculations made (broken down by gender), appropriate tables were made and interpreted. Results. 37% of boys and 32% of girls declare to watch television. This is the most common form of spending free time. 72% of boys surveyed and 61% of girls regularly participate in physical education classes. As many as 46% of the boys surveyed and 42% of girls admitted that they consume sweets at least 5 times a week and fast food at least once a week by 24% boys and 21% girls. Conclusions. Research has shown the existence of a number of irregularities in the way of feeding young people. The widely-held belief that slim figure is an advantage nowadays induces many people to use many weight loss diets or starvation diets, which excessive use can pose a threat to the developing organism. Respondents also show insufficient physical activity.

Key words: adolescents, eating habits, physical activity.