The aim of this study was to investigate the contribution of demographic, emotional and behavioral factors in explanation of overeating in situation of quarantine caused by COVID19. There were 535 participants, 26% males and 74% females. Study was conducted online, using the questionnaire that was spread through social media. In order to minimize the gender bias in favour of women, we also used snowball sampling. The questionnaire was consisted of demographic questions, Adult Eating Behaviour Questionnaire, Perceived Stress Scale, Scale of Perceived Social Support, COPE Inventory for evaluating coping as disposition, UCLA Loneliness Scale and, as a criterion, Scale of overeating constructed for the purpose of this study. To examine the role of demographic and situational variables we used age, gender, level of education, perceived weight, level of boredom, number of people in the household and the amount of exercise during quarantine period. Hierarchical regression analysis showed that during quarantine individuals who have a tendency to overeat are women, those who were exercising less, were bored more frequently, have tendency to emotional overeating, react more to the signs of food in their surrounding and tend to use less problem-focused coping. Total explained variance was 30.1%, and the highest individual contribution in explaining overeating during quarantine was by the Emotional overeating subscale (β=.345; p<.001) from the Adult Eating Behaviour Questionnaire.