Exploration of orthorexia nervosa and diagnostic overlap with eating disorders, anorexia nervosa and obsessive-compulsive disorder.

ON has been proposed as a psychiatric disorder, and it shares theoretical overlap with several existing disorders. This study adopts a novel approach to assessing and exploring the overlap of ON with EDs, AN and OCD. Results suggest that ON shares more overlap with EDs and might best be understood as a subtype of EDs or AN.