International Journal of Preventive Medicine (Int J Prev Med)2008-78021182020092723302330ENChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, IsfahanChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, IsfahanChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, IsfahanDepartment of Epidemiology, Non-communicable Diseases Research Center, Alborz University of Medical Sciences, KarajChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, IsfahanDepartment of Epidemiology, Chronic Diseases Research Center, Endocrinology and Metabolism Population Sciences Institute, Tehran University of Medical Sciences, TehranDepartment of Pediatrics, Ahvaz Jundishapur University of Medical Sciences, AhvazDepartment of Health Psychology, Research Center of Education Ministry Studies, TehranBureau of Family, Population, Youth and School Health, Ministry of Health and Medical Education, TehranBureau of Family, Population, Youth and School Health, Ministry of Health and Medical Education, TehranChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, IsfahanChild Growth and Development Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan20200927<p><strong>Background</strong>: This study aims to determine the factors affecting the tendency to lose weight (TLW)<br />and its methods in Iranian children and adolescents.</p><p><strong>Methods</strong>: In this cross‑sectional nationwide study<br />14800 students, aged 7–18 years, living in 30 provinces of Iran were selected via multistage cluster<br />random sampling method. The dietary and physical activity habits and TLW as well as psychosocial<br />health status, anxiety, self‑satisfaction, and change in dietary behaviors were assessed by the global<br />school‑based student health survey (WHO‑GSHS) questionnaire. Multivariate logistic regression model<br />was used to identify factors influencing TLW.</p><p><strong>Results</strong>: Overall, 14274 students (participation rate of<br />99%), consisting of 51% boys and 71.4% urban residents, completed the study. Of them, 37.7% (51.4%<br />Girls and 48.6% boys) tended to lose weight. In multivariate model, the odds for TLW was 12%<br />higher in students aged 13–18 years than those aged 6–12 years (OR = 1.12, 95% CI: 1.02 to 1.23;<br />P &lt; 0.001). Students with high anxiety level were 43% more likely to have TLW (OR = 1.43, 95% CI:<br />1.28–1.59; P &lt; 0.001). The odds of increasing physical activity for weight loss was 22% lower in obese<br />than in normal weight students (OR = 0.78, 95% CI: 0.66 to 0.93; P &lt; 0.001).</p><p><strong>Conclusions</strong>: TLW was significantly higher in girls, as well as in those with higher anxiety level. In addition to dietary change,<br />increasing physical activity should be encouraged among children and adolescents with excess weight.<br />Public education regarding proper lifestyle change for reaching healthy weight should be underscored.</p>http://ijpm.mui.ac.ir/index.php/ijpm/article/view/2330http://ijpm.mui.ac.ir/index.php/ijpm/article/download/2330/717718172