The association between weight loss behaviors and body weight perception in Chinese adolescents: 2007-2022.

Background: Weight misperceptions are common in children and adolescents, which is related to the engagement of weight loss behaviors. The aim of this study was to investigate the association between body weight perception and weight loss behaviors of lower-calorie diets and increased levels of physical activity (PA).

Methods: The Ningbo Youth Risk Behavior Survey was conducted from 2007 to 2022. A multistage, stratified cluster sampling procedure was utilized to draw target adolescents aged 12 to 18 years participating in each survey wave (2007, 2012, 2017, 2022). Data of anthropometry, weight perception, and weight loss behaviors were collected through self-administered questionnaires. A binary generalized linear model was used to examine associations between body weight perception and weight loss behaviors of lower calorie diets and increased levels of PA.

Results: The sample sizes for each survey wave were 777, 885, 1588 and 2638. The prevalence of overweight (OW)/obesity (OB), self-perception of OW/OB and overestimated perception increased from 7.6%, 27.0% and 29.1% in 2007 to 16.3%, 39.9% and 41.4% in 2022, respectively. Adolescents that perceived themselves as OW/OB had higher odds of lower-calorie diets (OR: 4.2, 3.3-5.4) and increased level of PA (OR: 3.8, 2.9-5.0), whereas adolescents that perceived themselves as underweight had lower odds of lower-calorie diets (OR: 0.371, 0.253-0.542) and increased levels of PA (OR: 0.381, 0.295-0.559).

Conclusion: OW, self-perception of OW/OB and overestimated perception were prevalent in Chinese adolescents. Self-perception of OW/OB was positively associated with lower-calorie diets and increased levels of PA. The results can support public health specialists to promote health education of body perception and improve self-esteem in Chinese children and adolescents.