Biological normalcy and body fat: Obesity prevalence, fat stigma, and allostatic load among late adolescents and young adults

Objectives: Biological normalcy provides a framework to assess tensions between clinical definitions of "normal," statistical norms, and normative beliefs. A prevailing cultural belief is obesity directly causes poor health, but research has demonstrated consequences of fat stigma. Previous research linked fat stigma and allostatic load (AL) in adults, but this has not been demonstrated in youth, and the role of obesity prevalence is unknown. This study assesses the relationship between fat stigma and AL among youth from counties varying by obesity prevalence.Materials and methods: Undergraduates from 38 counties across the US state of Indiana (n = 175) were recruited. Fat stigma was measured using the brief stigmatizing situations inventory (SSI). AL was calculated using eight biomarkers representing cardiovascular, metabolic, and immune function. Poisson regression assessed relationships of interest and adjusted for potential confounding. An interaction term and stratified analyses were used to assess moderation.Results: SSI was not statistically associated with obesity prevalence (RR = 0.96, p = 0.173) but did statistically significantly predict AL (RR = 1.019, p = 0.045) when adjusting for confounders. Obesity prevalence moderated the relationship between SSI and AL (RR = 0.993, p = 0.001).Discussion: Results suggest that fat stigma, regardless of body fat percentage, is associated with physiologic wear and tear on the late adolescent body, and that exposure to obesity during earlier adolescence moderates this relationship. Those most at risk for high AL reported high fat stigma and lived in counties with relatively low obesity prevalence during earlier adolescence, suggesting vulnerability to fat stigma may be heightened where obesity is less common.