Objective: The study investigates the changes in body composition, dietary intake and physical activity of Polish health faculty undergraduates. Methods: 340 university students were measured at the beginning their studies. Subsequent measurements were performed at the beginning of the following academic years. In total, 82 men and 87 women were included in the analysis. The measurements included anthropometric parameters and the amount of consumed nutrients. Using Seven-Day Physical Activity Recall Questionnaire measured students' physical activity. Results: Across three years at university 65.1% of students showed an increase in body mass. Men displayed an increase in body weight (1.6 kg) and waist circumference (4.1 cm). Women's weight changed insignificantly. Participants' energy intake increased statistically significantly after the 1st year and decreased after the 2nd year. In men there was observed decline in energy expenditure between the 1st and 2nd year. Conclusion: Transitory unfavorable changes were observed in students' nutrition and physical activity.