The Journal of

 Background: Vitamins are organic compounds required as vital nutrients and vitamin deficiency is a venturesome condition for human body.Vitamin D deficiency is a world-wide epidemic and it’s widespread deficiency is a concern in Middle East countries. The major cause of vitamin D deficiency in many countries is the lack of sunexposure as a result of cultural norms of covering.

 The aim of this study was to determine the Yazd high school students’ knowledge, attitude and practice towards vitamin D effects on human health.

 Methods: A self-administered, structured, questionnaire, researcher made was conducted to investigate knowledge, attitude and practice of high school students. The questionnaires were given to 312 students (153boys and 159 girls) of 8 Yazd high schools. We used SPSS software and Paired t-test, ANOVA and chi² test for analyzing the data.

 Result: Of total participants, 49% were boys and 51% were girls. This study showed that among the 312 cases studied, 2.2% had good knowledge and 39.4% had average knowledge about vitamin D effects on human health. 21.5% of the cases had good attitude and 18.8% of them had goodpractice. Mean knowledge score was 15.11+- 4.83 of 31, mean attitude score was 18.94+-3.32 out of 28 scoreand, and mean practice score on vitamin D effects on human health was 13.69 +-2.71 of 20. There wasn’t a significant difference between knowledge and attitude among girls and boys but boys practice was better than girls and there was a significant difference in this case.

 Conclusion:Lack of knowledge,attitude and practice could endanger people's health so developing some training programs seems to be necessary.