Document Type : Original Article


1 Department of Nutrition, Food Security Research Center and School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran,

2 Departmert of Biostatistics and Epidemiology, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran


Background and Aim: Adolescents’ overweight problems have been paid much attention due
to their significant increase in recent decades in developed countries. Poor eating patterns
subsequently affect their self‑efficacy and self‑concept. Therefore, paying attention to the
nutritional knowledge of overweight students in this period is essential. This study examines the
relationship between self‑efficacy, self‑concept, and nutritional knowledge of overweight students
in the city of Isfahan. Materials and Methods: The 140 overweight students who participated in
this descriptive, analytical study with were randomly selected from one of five areas of Isfahan
city in the year 2011‑2012. Questionnaires for data collection in this study included demographic
form, nutrition knowledge, Cooper Smith self‑esteem, and general self‑efficacy questionnaire.
Data were analyzed by ANOVA, regression, and Pearson’s correlation coefficient with statistical
package in social sciences version 18. Results: There was a significant correlation between
whole nutritional knowledge and self‑efficacy (r = 0.29, P > 0.001) and self‑concept (r = 0.26,
P = 0.002). There was a significant correlation between self‑efficacy and self‑concept (r = 0.3,
P = 0.001). Furthermore, in the selection of food section there was no significant correlation with the
self‑concept (r = 0.147, P = 0.083). Regression analysis between self‑concept, self‑efficacy, family
dimension, father’s education, mother’s education, father’s occupation, mother’s occupationa
and income with nutrition knowledge showed that these eight variables explain 17.7% of the
variance in health behaviors totally. Conclusion: By conducting this study, and revealing the direct
relationship between nutritional knowledge, self‑concept, and self‑efficacy, we could conclude
that if nutritional knowledge of overweight students is promoted, this factor would lead to an
increase their self‑concept and self‑efficacy in order to adopt healthy behaviors and have the
expected healthy eating and healthy life‑style.


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