Object: The goal was to investigate differences in excessive weight, eating habits and physical activity between children living in the Split and two neighbooring islands. Materials and methods: Study included 149 male and female pupils in the sixth grade of primary school in Split and on the islands of Brac and Solta. Results: It was found that there is a statistically significant difference in mean BMI with respect to the location of students, where pupils of the city of Split had lower BMI. There is a statistically significant difference in the habit of having breakfast with respect to the location where the pupils of the city of Split to a greater extent than pupils eat breakfast island of Brac and Solta. A statistically significant difference was found in the connection between the practice of eating "fast food" and the location where the pupils of the city of Split have a growing practice consumption of "fast food" of pupils of the island. The habit of consuming snacks statistically significantly associated with BMI where the average lowest BMI have pupils who consume fruit as a snack. It was found that there is a statistically significant relationship between BMI and habits of eating breakfast. There is a statistically significant difference in mean BMI due to the habit of watching TV or using the computer. Pupils who spend every day three or more hours watching TV or using the computer had a statistically significant higher average BMI. There is a statistically significant difference in the quality of snacks with regard to gender. The female pupils eat healthier foods (fruits) as a snack from male pupils who eats sandwich. Conclusion: Overweight and obesity in younger age show a long-term association with many chronic non-communicable diseases as well as with increased mortality. Without persistent and determined approach to the prevention and treatment of obesity effects on health and society will be long-lasting.