Introduction and objective:
Children and adolescents are a group particularly exposed to nutritional consequences resulting from the consumption of potentially harmful food products. School-age children should eat 5 meals a day with 3–4 hour breaks between meals. It is also acceptable to eat snacks, however attention should be paid that they provide health-promoting ingredients. The aim of the study is assessment of the frequency of consumption of snacks and sweetened beverages and physical activity by children and adolescents at school age, and determination whether there are any relationships between the age of the surveyed schoolchildren and the frequency of consumption of snacks and sweetened beverages.

Material and methods:
The study was conducted in 2022 among 204 schoolchildren aged 13–16 attending primary schools in the Silesian agglomeration. The research tool was an author-constructed questionnaire. To determine the value of the body mass index of the surveyed schoolchildren the OLA and OLAF charts for children and adolescents aged 3–18 were used. Statistical analysis was performed by means of Statistica 13.3 using the Student’s t-test and chi2 test. P<0.05 was considered statistically significant.

Results:
Shoolchildren aged 10–12 most often reached for snacks while watching TV (25.5%), while those aged 13–16 while using a computer (20.1%). Chocolate, chocolate bars, cakes, biscuits, gummies, chocolate creams, candies and confectionery were consumed most often several times a month.

Conclusions:
Consumption of snacks by children and adolescents during the day is a frequent problem. Both age groups are characterized by snacking while spending leisure time passively, which is also associated with an insufficient level of physical activity undertaken by them.