BACKGROUND: Appropriate nutrition is one of the most important factors affecting the proper development of man, nutritional status and maintaining good health. Adolescence is a period of development of skills of self-determination and self-realization, also in the case of nutrition. Children and school-age youth are the group most vulnerable to the effects of incorrect nutrition. The way of nutrition during this period determines psychophysical and emotional development, effectiveness in learning process and has influence on health in adulthood. OBJECTIVE: The aim of this study was to evaluate the habits and nutrition preferences in secondary school students from Rzeszów and Krosno age 16-19 years and to identify the differences between their eating behaviours. MATERIAL AND METHODS: The study involved 300 secondary school students from Rzeszów and Krosno. The research material was the Authors’ questionnaire containing questions examining the eating habits of surveyed students. The statistical analysis was performed using the program StatSoft, Inc. STATISTICA version 12.0. To evaluate the differences between the two examined qualities there was used the Chi2 test of independence. As the statistically significant level there was assumed the level of p ≤ 0.05. RESULTS: In the surveyed group of high school students, more than half (59.66%) ate 4-5 meals a day. Snacking between meals declared 95% of high school students. Between meals the youth most frequently consumed fruits and vegetables (72.99%) and sweets (59.66%). Daily consumption of first breakfast before leaving the home declared more than half (62.33%) of the surveyed youth. Consuming products containing complete protein several times a week was declared by 49%. Whole wheat bread was daily consumed by 10.33% of the respondents, and grain products are daily consumed by 52.66% of the youth. 43.33% every day drank milk and milk products, while fruits and vegetables several times a day were consumed by 59.66% of the surveyed students. Consumption of products of “fast-food” type several times a month was declared by 49.66%, while irregular consumption of meals was declared by 20.33% of high school students. Physical activity was declared by 93.99%, and 3-5 times a week by only 21.66% of the surveyed students. CONCLUSIONS: The conducted research shows that eating habits of most of the surveyed secondary school students both from Rzeszów and Krosno are satisfactory. The comparison of dietary habits among secondary school students showed no significant differences. Both groups committed similar errors: sweets snacking between meals, irregular meals and insufficient physical activity. A positive phenomenon was snacking of fruit and vegetables between meals and selection of mineral water and juices as the most frequently consumed beverages.