The child health and sports center, at the Meir Medical Center, runs for over 10 years an intervention program to treat obese children. The program includes physical activity, nutritional intervention and behavioral treatment. A similar program exists in the nearby city of Hadera. The aim of the programs is to promote weight loss, encourage physical activity and modify behavior in order to get long term results. The aim of the present study is to try and identify the demographic and behavioral characteristics of children who succeed in the program.