This thesis speaks about the influence of diet on the nutritional status of preschool children. The thesis deals with the subject of nutrition, obesity and its causes and consequences, malnutrition, the importance of physical education and nutrition of preschool children. Previous research indicates that there is an increasing number of overweight children, although most still belong to the group of normal weight. The aim of this research is to determine the anthropometric characteristics of children and their nutritional status, and to make a comparison with their eating habits and sport activity in their free time. The research was conducted in the Zagreb kindergarten "Vrapče", regional facility "Rašljice" on 21 children during March 2022. The results showed that most children have normal weight and there is no eating habits difference or anthropometric status difference according to the gender of children. Furthermore, there are statistically significant associations between anthropometry and dietary variables. Children who have a higher BMI are less involved in sports, have more meals a day, and eat sweets and snacks more often. Children's eating habits are generally satisfactory because most of them consume fruits and vegetables every day, have breakfast before going to kindergarten and drink water more often than carbonated or sweetened juices.