Orthorexia nervosa and eating disorder behaviors: A systematic review of the literature

Background: Orthorexia nervosa (ON) involves obsessive thoughts about healthy eating and distress related to this obsession. There is still dispute over whether ON should be considered on the obsessive-compulsive spectrum, the eating disorder (ED) spectrum, or as its own disorder. Based on current research, orthorexic behaviors seem to be closely related to eating disorder behaviors. However, given the range of instruments used to measure ED and ON, and the lack of consistency in the specific ED domains explored, a review of the current literature is warranted. Objective: The objective of this study was to review the literature relating ON and ED symptoms in an effort to understand the nature of their relationship, and to identify ED symptom domains most closely related to ON. Methods: A search was conducted on PubMed, Science Direct, and Web of Science using the term "orthorexia" and at least one of the following: "anorexia nervosa," "bulimia nervosa," "eating disorder," "arfid," "restrictive," "body image," "weight concern," "shape concern." After exclusion criteria were applied, 42 articles were included in the review. Results: The results indicated that ON is consistently related to both trait and disordered restrictive eating symptoms of anorexia nervosa, and weight control motivations for food choice. However, ON was less consistently related to binge-spectrum eating disorder symptoms, emotional eating, uncontrolled eating, or body dissatisfaction/shape and weight concerns. Conclusion: The finding that ON symptoms are related to restraint and weight loss efforts, but not to body dissatisfaction or dysregulated eating suggests that ON may represent a distinct ED.