Body size perception and weight control in youth: 9-year international trends from 24 countries

作者：Quick V^*; Nansel T R; Liu D; Lipsky L M; Due P; Iannotti R J

来源：International Journal of Obesity, 2014, 38(7): 988-994.

DOI：10.1038/ijo.2014.62

• adolescents
• body image
• dieting
• weight perceptions
• overweight
• development

OBJECTIVES: To examine 9-year trends and relationships regarding misperceptions of body size and dieting for weight loss among adolescents from 24 countries, and explore the influence of country-level overweight prevalence. %26lt;br%26gt;METHODS: Sociodemographic characteristics, body size perception and dieting for weight loss were assessed in the Health Behaviour in School-aged Children survey conducted in 24 countries cross-sectionally at three time points (2001/2002, 2005/2006 and 2009/2010). Logistic regression models examined change over time in overestimation of body size in non-overweight adolescents, underestimation of body size in overweight adolescents, dieting for weight loss in non-overweight and overweight adolescents and relationships between body size perception and dieting. Analyses were stratified by weight status and sex. Covariates included country-level overweight prevalence, family affluence and country level of development. Body mass index was only included in models examining dieting for weight loss. %26lt;br%26gt;RESULTS: Country-level overweight prevalence increased over time (11.6-14.7%). Compared with Time 1, overweight adolescents had greater odds of body size underestimation at Time 3 (odds ratio (OR) = 1.68 for girls; OR = 1.10 for boys), whereas non-overweight adolescents had lower odds of body size overestimation at Time 3 (OR = 0.87 for girls; OR = 0.89 for boys). Controlling for country-level overweight prevalence attenuated these relationships. Compared with Time 1, overweight and non-overweight boys were 10% more likely to diet at Time 3, whereas overweight and non-overweight girls were 19% and 16%, respectively, less likely to diet at Time 3. Controlling for country-level overweight prevalence did not impact trends in dieting for weight loss. Additionally, the association of self-perceived overweight with increased odds of dieting diminished over time. %26lt;br%26gt;CONCLUSIONS: Body size perceptions among adolescents may have changed over time concurrent with shifts in country-level body weight. However, controlling for country-level overweight prevalence did not impact trends in dieting for weight loss, suggesting a potentially stronger impact of social comparison on weight-related perceptions than on behavior.

• 出版日期2014-7
• 单位NIH