effectiveness of training on preventative nutritional behaviors for type-2 diabetes among the female adolescents: examination of theory of planned behavior

background: since type-2 diabetes is the most common chronic disease among iranian female adolescents, we applied theory of planned behavior to examine the effect of training to intention to preventative nutritional behaviors for type-2 diabetes among female adolescents.   methods: in this experimental study 200 (11-14 year old) girls from 8 schools of tehran city (100 in each intervention and control group) were recruited based on cluster sampling method during two stages. for intervention group, an educational program was designed based on the theory of planned behavior and presented in 6 workshop sessions to prevent type-2 diabetes. the data were collected before and two months after the workshops using a valid and reliable (α=0.72 and r=0.80) author-made questionnaire based on ajzens tpb questionnaire manual. the data were analyzed using t-test, chi-square test and analysis of covariance.   results: findings indicate that the two groups were homogeneous regarding the demographic characteristics before education, but the mean score of the theory components (attitudes, subjective norms, perceived behavioral control, and intention) was higher in the control group. also, results showed all of the theory components significantly increased after the education in the intervention group (p=0.000).   conclusion: training based on the theory of planned behavior enhances the intention to adherence preventative nutritional behaviors for type-2 diabetes among the studied female adolescents.