Aim: The COVID -19 pandemic has changed the way people live, and children are particularly at risk because of their vulnerable age. The aim of this work was to evaluate the changes in nutritional status, physical activity, and eating habits of elementary school-aged children during the Covid 19 pandemic.    Methods: The study was conducted from February to April 2021 and included 197 primary school children, 100 boys, and 97 girls. A questionnaire was used to collect data on lifestyle, eating habits, and physical activity outside school. The Mediterranean Diet Quality Index for children and adolescents was used to determine membership in the Mediterranean diet. The kinanthropological and anthropological data of the students were obtained from the diary of the physical education and health teacher.    Results: The average rating of the quality of the children's diet, as determined by the Mediterranean Diet Quality Index for Children and Adolescents, showed a moderate affiliation with the Mediterranean diet. Before online instruction, 65.9% of students ate breakfast daily, whereas during online instruction, 75.7% ate breakfast (p< 0.001). Results showed that students exercised statistically significantly more before online instruction than during online instruction (p< 0.05). Students had weaker kinanthropological scores than before beginning online instruction.    Conclusions: According to the results, students' diet is of average quality, and some habits, such as breakfast, have improved, while physical activities have decreased significantly during the pandemic. Therefore, the promotion of proper nutrition and physical activity through public health programs should be emphasized to educate both children and parents about the importance of proper nutrition, physical activity, and responsible use of various media. Cilj: Pandemija COVID-19 promijenila je način života ljudi, a djeca su zbog svoje dobi posebno ugrožena. Cilj rada bio je procijeniti promjene stanja uhranjenosti, navika tjelesne aktivnosti i prehrane kod djece osnovnoškolske dobi tijekom pandemije COVID-19.Metode: Istraživanje je provedeno u školskoj godini 2020/2021 i obuhvatilo je 197 djece iz osnovne škole, 100 dječaka (12,21 ± 1,17) i 97 djevojčica (12,44 ± 1,20). Podaci o životnim i prehrambenim navikama te o tjelesnoj aktivnosti izvan škole dobiveni su iz anketnog upitnika. Za određivanje pripadnosti mediteranskom načinu prehrane koristio se Mediteranski indeks kvalitete prehrane za djecu i adolescente. Kinantropološki i antropološki podaci o učenicima preuzeti su iz dnevnika učitelja tjelesne i zdravstvene kulture.Rezultati: Prosječna ocjena kakvoće prehrane djece ocijenjena prema Mediteranskom indeksu kvalitete prehrane za djecu i adolescente, pokazala je srednju pripadnost mediteranskom načinu prehrane. Prije online nastave doručkovalo je svaki dan 65,9% učenika dok je za vrijeme online nastave njih 75,7 % doručkovalo (p<0,001). Rezultati su pokazali da su se  učenici statistički značajno više bavili sportom prije online nastave nego za vrijeme online nastave (p<0,05). Učenici su imali slabije kinantropološke rezultate poslije nego prije početka online nastave te nisu uočene statistički značajne razlike u stanju uhranjenosti. Zaključci: Prema dobivenim rezultatima učenici pripadaju srednjoj kvaliteti prehrane, a neke navike, poput doručkovanja su se poboljšale dok su se navike tjelesne aktivnosti značajno smanjile za vrijeme pandemije. Stoga treba naglasiti promicanje pravilne prehrane i tjelesne aktivnosti putem javnozdravstvenih programa kako bi se i djeca i roditelji educirali o važnosti pravilne prehrane, tjelesne aktivnosti.