The aim of this research was to determine the differences in the nutritional status of children aged 5 and 6, as well as the differences in the nutritional status of boys and girls staying in the kindergarten Markuševec, regional facility in Sesvete. For this research, data on body mass (BM) and body height (BH) of children were needed, and then the body mass index (BMI) was calculated from the collected values, and then its percentage (BMI perc.) was determined in order to arrive at nutritional status. children. 75 respondents participated in the research, 31 children aged 5 and 44 children aged 6. The group of 75 respondents consisted of 38 girls and 37 boys aged 5 and 6. After the research, it was determined that there are differences in the state of nutrition among children aged 5 and 6, as well as between boys and girls of the same age. The paper will also consider the nutrition of preschool children, which has recently become an increasing challenge because life has become more hectic and more and more time is spent consuming 'fast' and unhealthy food, which has a negative effect on the healthy development of children. Also, children's physical activity is decreasing due to the transition to a more modern lifestyle in which children do not have enough time and space for physical activity and outdoor play. The basic idea that starts when writing on this topic is education about the importance of healthy nutrition and activities for children, as well as encouraging them to solve a problem that is increasingly common among young people. In order to develop each individual child into a healthy adult and provide the highest possible quality of life, it is necessary to introduce healthy nutrition and activity into everyday life, but also to frequently perform anthropometric measurements in kindergartens with the aim of timely responding to misbehavior.