Randomized, controlled, open, comparative intervention study in 270 children at risk for obesity.Patients will be randomly allocated into one of two behavior intervention groups or control group in ratio of 1:1:1.The study will consist of two main periods: an intervention period of 3 months followed by 21 months of a follow up period. During the intervention period, participants (parents or both parents and children, depending on randomization) will attend a behavior intervention program once a week, each session will last one hour and would be guided by dietician and psychologist. Follow up visits will be performed at the clinic (for participants in al 3 groups) at months 0, 3, 12 and 24.