Why do eating disorders and obsessive-compulsive disorder co-occur?

Area of Science:

• Psychiatry
• Clinical Psychology
• Behavioral Science

Background:

• Eating disorders and obsessive-compulsive disorder (OCD) frequently co-occur.
• Understanding the underlying factors contributing to this comorbidity is crucial for effective treatment.
• Previous research has explored shared risk factors, but a dimensional approach offers new insights.

Purpose of the Study:

• To investigate the dimensional relationship between eating pathology and obsessive-compulsive symptoms.
• To examine the mediating roles of personality traits (neuroticism, perfectionism) in this comorbidity.
• To identify unique associations between specific symptoms that are not explained by shared personality factors.

Main Methods:

• Utilized a community-based sample (N=407) with diverse demographics.
• Administered self-report measures assessing eating pathology, obsessive-compulsive symptoms, perfectionism, and neuroticism.
• Employed hierarchical multiple regression to analyze the interplay between these variables.

Main Results:

• Neuroticism and perfectionism significantly mediated the link between most eating disorder and obsessive-compulsive disorder symptoms.
• Body dissatisfaction showed unique associations with checking, cleaning, and obsessive rituals, independent of personality traits.
• These findings highlight the substantial role of shared personality dimensions in the comorbidity.

Conclusions:

• Shared personality traits, particularly neuroticism and perfectionism, are key contributors to the comorbidity of binge eating/dietary restraint eating disorders and OCD.
• Body dissatisfaction may represent a distinct pathway contributing to symptom overlap.
• Further research into neurocognitive processes underlying compulsive behaviors and body checking is warranted.