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Not so “Atypical” Anorexia Nervosa

Not so “Atypical” Anorexia Nervosa: Clinical History, Diagnostic Considerations, and Treatment Approaches Atypical anorexia nervosa (AAN) is a sub-diagnosis for patients who meet all the criteria for anorexia, except for being underweight. However, the term “atypical” is a glaring misnomer, as AAN affects up to 4.9% of people during their lifetime, whereas anorexia nervosa (AN) affects about 0.6%. Atypical anorexia became a subtype of other specified feeding and eating disorder (OSFED) in 2013, leading to many common misconceptions about the severity of the illness and its best treatment approach. Using data from a large patient population receiving virtual treatment across the US, this presentation explores these diagnostic labels, assesses the severity and treatment trajectory for patients with AAN compared to AN, and proposes considerations for future diagnostic clarifications.