The relationship between internalised weight bias and biopsychosocial outcomes in children and youth: a systematic review.

Objective: To synthesise the evidence on the relationships between internalised weight bias (IWB) and biopsychosocial health outcomes in individuals ≤ 25 years. Methods: A systematic review was conducted by searching five scientific databases up to May 2022 to retrieve studies that investigated associations between IWB and biopsychosocial outcomes. Articles with participants ≤ 25 years, at least one validated measure of IWB, one measure of a biopsychosocial outcome, and were observational were included. Excluded articles involved systematic literature reviews, case study reports, intervention studies, meta-analyses, grey literature, pilot, and feasibility studies. Quality assessment was carried out using the American Dietetic Association Quality Criteria Checklist. The protocol was registered with PROSPERO, ID number CRD42022323876. Results: Two hundred and sixty-six articles were identified. Nineteen were eligible for inclusion, (15 cross-sectional and 4 prospective). The Weight Bias Internalization Scale and the Weight Self-Stigma Questionnaire were the most used tools to assess IWB with large heterogeneity in tool types used to assess biopsychosocial measures. IWB had positive associations with psychopathology, eating disorder symptomology, higher BMI, being female, and experiences of weight stigma. It was negatively associated with quality of life, body image, physical activity, social ability, self-esteem, and socioeconomic status. Discussion: IWB associated with adverse biopsychosocial outcomes in children and youth populations. IWB may be more clinically relevant in assessing at-risk children and youth than physical weight due to its psychosocial aspects and ability to expand beyond the scope of BMI. Research would benefit from better assessment tools designed for children and youth that accurately measure IWB. Future research should focus on increased diversity and longitudinal study designs with children and youth-specific populations. Plain English Summary: The objective of this systematic review was to bring together the current evidence on the relationship between internalised weight bias (IWB) and health outcomes in individuals under the age of 25. The systematic review was conducted by searching five scientific databases to retrieve studies that investigated associations between IWB and biopsychosocial outcomes. Two hundred and sixty-six articles were identified, with nineteen eligible for inclusion into the review. IWB was associated with increased mental illness, eating disorder symptoms, BMI, being female, and experiences of weight stigma. It was associated with a decreased quality of life, body image, physical activity, social ability, self-esteem, and socioeconomic status. Overall IWB was found to be associated with negative health and social outcomes in children and youth populations. Future research in this area should focus on increased diversity, longitudinal study designs and designing children and youth specific tools that accurately measure IWB. [ABSTRACT FROM AUTHOR]