Weight bias internalization among adolescents in Spain: psychological correlates across gender diversity and weight status

Weight bias internalization refers to the negative weight-related attributions applied to oneself, but it does not just occur in the highest weight statuses, but rather exists across the entire weight spectrum. There is a negative impact associated to increase psychological problems in adults, however, it has been less studied among the adolescent Spanish population. In this study, we assess the relationship between the internalization of weight bias, social attitudes towards appearance, body appreciation and self-esteem, and potential differences regarding gender and weight status. A community sample of 1258 Spanish adolescents between 12 and 18 years old (46.3% male gender; Mage = 15.58; SD = 1.59; 49.5% female gender; Mage = 15.59; SD = 1.67; and 4.1% non-binary gender; Mage = 14.86; SD = 2.86) participated in the study. The Modified Weight Bias Internalization Scale (WBIS-M), the Rosenberg Self-Esteem Scale (RSES), and the Sociocultural Attitudes Towards Appearance Questionnaire (SATAQ-4) were used. ANOVA’s test and bivariate correlations were performed. The results suggest that females (t = -.55; p ≤ .001) and non-binary adolescents (t = .64; p ≤ .01) have higher levels of WBI-M compared to males. Regarding weight status, the group with obesity (t = 1.39; p ≤ .001) and the group with overweight (t = -.81; p ≤ .001) have higher levels of WBI-M compared to the normal weight group. Significant correlations between WBI-M and the assessed psychological variables were found in the total sample, and across all-gender and weight categories, except for the underweight group. These results are a first approximation to the internalization of weight bias in a Spanish adolescent sample and highlight the need to introduce this concept in prevention and psychological interventions in school context.