Evaluation of education in promoting healthy lifestyle behaviors among adolescent girls, according to the Health Belief Model

adolescence is one of the most valuable periodin life which is foundation of the next stage. Adolescents’sedentary lifestyle and unhealthy eating behaviors threat the present and future life in this age group. The aim of this study was to evaluate healthy lifestyle education based on health belief model among adolescents. this interventional study was conducted on 113studentswho were selected from two schools in an educational district in Mashhadand viathe cluster sampling method. They were divided intoa case group (56) and a control one (57). datawere gathered using demographic، knowledge and performance questionnaires and also the health belief model constructs. The reliability of the questionnaires was determined by test- retest and alpha. Educational program based on health belief model was designed and implemented in four 50-minute sessions. Thedata were analyzed using SPSS software (11. 5). There was observed a significant difference between after and before intervention in meanscores of knowledge (P=0. 033)، Performance (P=0. 001) and also physical activity، puberty health، structures of health belief model include sensitive (P=0. 013)، intensity (P=0. 008) and efficacy، perceived benefits (P0. 001) and perceived barriers (P=0. 001) while، there was no significant difference in the case group. Health education programs which are based on health belief modelcan be effective in promoting health awareness، perceptions of cognitive and healthy lifestyle behaviors in adolescents.