IRCT201607052857N2 IRCT 2016-07-27 Vice Chancellor for research of Isfahan university of medical sciences The effect of health education on adolescent nutrition behavior The effect of school-based educational interventions on nutrition behaviors of adolescents girls based on social cognitive theory 2016-09-22 anticipated 230 Complete https://irct.ir/trial/2723 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: Table of random numbers. N/A -. Intervention 1: adolescents, parents and teahers will recieve educational program. Adolescents education class contains 8 sessions of 60 minutes each over eight weeks period. adolescents will recieve participatory homeworks too. Sessions are planned to develop healthy nutrition behaviors including: Small group presentations, Facilitated discussion, Trigger films, Develope discussion, Provide successful examples of adolescents and Guided goal setting activities.Parents and teachers education package will be delivered through two workshops for parents and teachers separately through Lectures and pamphlets and SMS to improve social support for adolecents which is considered in social cognitive theory. Intervention 2: The control group will continue to receive standard government routine health education by health teachers. Routine health education offers education to students during monthly class contacts and don’t have nutritional education sessions for parents and teachers.