Social isolation turned out to be a new experience to affect various aspects of life. The objective of the research study was to identify the impact of COVID-19-associated social distancing on  dietary behaviours of students at the State Higher Vocational School in Nowy Sącz. The research tool was a survey questionnaire covering open-ended and close-ended questions on the issues referring to dietary behaviours, regularity and frequency of eating meals and specific groups of products, health state, contracting COVID-19, and supplementation of the diet with vitamin D.  Based on the information provided by the students, a body mass index (BMI) was calculated before and during pandemic. Among the surveyed, the prevailing group were full-time, bachelor  course, female students who lived in villages. Of all the respondents, about 20 % of men and 20 % of women claimed to have been ill with COVID-19. Most of the infected experienced the loss of smell and taste. The majority of COVID-19 patients did not report any disease-associated changes in the frequency of eating meals. Compared to the pre-pandemic period, during the pandemic  there were found no significant changes in the average body mass and body mass index (BMI) of both the men and the women. The impact of pandemic on their dietary behaviours reported 45  % of the women and 36% of the men, especially as regards the number of consumed meals. As the reason thereof, the surveyed pointed out a reduced frequency of travelling, learning and  working online, stress and also limited family contacts. An increase was reported in eating salty and sweet snacks, in drinking coffee along with a slight decrease in eating meat, cold cuts and  legume seeds. The pandemic caused by the Sars-CoV-2 virus insignificantly affected the vitamin D supplementation among students at the State Higher Vocational School in Nowy Sącz.