Abstract
Background: Osteoporosis is one of the most common problems in health systems and a hidden epidemic in the modern world. The aim of the present study was to investigate osteoporosis-related nutritional behaviors based on the theory of planned behavior (TPB) in adolescent girls in Sari, Iran. Materials and Methods: This cross-sectional study was performed on 341 12-16-year high school students who were selected by multi-stage random sampling method in Sari, Iran. Data collection was carried out using a TPB-based researcher-made questionnaire consisting of three parts; part A included questions on demographic characteristics and osteoporosis-related diseases, part B discussed osteoporosis nutritional behaviors based on TPB constructs, including behavioral attitudes, subjective norm, perceived behavioral control, and intention and and part C was the Food frequency questionnaire (FFQ). Part A and B was completed by students and part C was completed based on account the number of food units the recommended standards Food Pyramid through interview. Data analysis was also performed using regression analysis, Pearson correlation and ANOVA in SPSS ver. 20. Results: The present study demonstrated a significant relationship between perceived behavioral control and osteoporosis predisposing nutritional behaviors (p <0.05). Also, among TPB constructs, subjective norm (β=0.138) and intention (β=0.136) were the main determinants of osteoporosis-preventive behaviors and subjective norm (β=0.182) and knowledge (β=0.155) played the most important role in determining osteoporosis-predisposing nutritional behaviors. Conclusion: Based on the results, there is a significant relationship between TPB constructs and osteoporosis-related nutritional behaviors. Considering the role of TPB constructs and lower consumption of the osteoporosis-preventing group, there is a need for educational interventions among adolescents, parents and other people influencing adolescents.
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