Body mass index in obsessive-compulsive disorder

Area of Science:

• Psychiatry and Mental Health
• Obesity Research
• Clinical Psychology

Background:

• Psychiatric disorders, excluding Obsessive-Compulsive Disorder (OCD), are commonly associated with overweight and obesity.
• Anecdotal evidence suggests individuals with OCD may have a lower Body Mass Index (BMI).
• The impact of comorbid depression on BMI in OCD patients remains largely unexamined.

Purpose of the Study:

• To investigate the relationship between OCD and BMI, assessing overweight/obesity risk.
• To determine how comorbid depression influences BMI in individuals with OCD.
• To compare BMI and overweight risk across different clinical groups and non-clinical controls.

Main Methods:

• Assessment of BMI, demographics, and clinical status in large samples.
• Inclusion of individuals with OCD, anxiety disorders, depressive disorders, comorbid anxiety/depressive disorders, and non-clinical controls (NCC).
• Statistical analysis controlling for demographic differences and recruitment methodology variations.

Main Results:

• No initial differences in BMI were observed across all groups.
• Individuals with OCD but without depression exhibited significantly lower BMI and overweight risk compared to all other clinical groups.
• Non-clinical controls were nearly twice as likely to be overweight compared to the non-depressed OCD subsample.

Conclusions:

• OCD is associated with reduced rates of overweight and obesity, particularly in the absence of comorbid depression.
• A 'purer' OCD phenotype appears to confer a substantial protective effect against overweight/obesity.
• Comorbid depression negatively impacts OCD patients by increasing obesity risk and potentially hindering treatment, warranting clinical attention.