IRCT2013103115211N1 IRCT 2013-11-27 Tehran University of Medical Sceineces The effect of of nutrition and physical activity education on nutrition and exercise behaviors weight in overweight and obese adolescents. SCT: Social cognitive theory Study on the Effect of Nutrition Education and Physical Activity intervention using Social Cognitive Theory for Overweight and Obese Student Girls of Middle School of Shahinshahr. 2013-12-01 anticipated 150 Complete https://irct.ir/trial/14540 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive. N/A Obesity. Intervention 1: intervention group: students and their parents will be taught about nutrition and physical activity with participating in theory and practical seminars, conferences and workshops (12 sessions and each session 60 minutes). In addition, 6 sessions will be held for Individual Counseling about nutrition and physical activity for students (each session 60 minutes). Other parts of education are comprised from sending 48 messages for students and their parents, educational CD and holding practical exercise classes for students (40 sessions and each session 90 minutes). All interventions will be done in 6 months. Intervention 2: Control group: During study no intervention will be done in control group. but after that, four education sessions will be held in control group for students and their parents. (each session will be 90 minutes ).