Weight Stigma's Effects on Misdiagnosis of Eating Disorders Among Laypeople and Healthcare Professionals.

Objective: There is limited research on weight bias in diagnosing eating disorders (EDs), particularly among healthcare professionals (HCPs). This is especially true for atypical anorexia nervosa, a diagnosis recently described in the DSM that includes people with anorexia nervosa symptoms who are not clinically underweight.

Method: Using a within-subjects design, we assessed diagnosis, diagnostic confidence, and ED-related medical knowledge among a sample of lay people and medical professionals. Participants read three clinical vignettes (counterbalanced to avoid order effects) of a woman with anorexia nervosa or atypical anorexia nervosa (described as obese) and were assessed on weight stigma and prior ED medical knowledge.

Results: Both lay people and HCPs were less likely to diagnose atypical anorexia nervosa and were less confident in that diagnosis than in the anorexia nervosa vignette condition. Lay participants' diagnostic bias, but not HCPs', was impacted by weight stigma; HCPs' confidence was impacted by weight stigma. In both cases, participants high in weight stigma were more accurate (lay sample) or more confident (HCPs) in diagnoses. Last, greater ED medical knowledge improved accuracy of diagnosis of vignette cases for the HCP sample that included snowball sample recruitment and CloudResearch participants and lay people, but not for the HCP sample recruited via snowball sampling only.

Discussion: These findings highlight the urgency for more public awareness and training for HCPs emphasizing that people of all sizes can present with restrictive eating disorders.