10003236 J Clin Psychiatry / Document Archive

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The article you requested is

Substance Use Disorders and Overweight/Obesity in Bipolar I Disorder: Preliminary Evidence for Competing Addictions.

J Clin Psychiatry 2007;68:1352-1357
Copyright 2007 Physicians Postgraduate Press, Inc.

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Objective: This investigation was undertaken to explore the relationship between alcohol/illicit drug dependence and overweight/obesity in individuals with bipolar I disorder.

Method: The data for this analysis were procured from the Canadian Community Health Survey-Mental Health and Well-Being (CCHS) conducted by Statistics Canada in 2002. Bipolar I disorder was defined as persons screening positive for a lifetime manic episode using the World Mental Health 2000 version of the Composite International Diagnostic Interview (WMH-CIDI). Substance abuse and illicit drug dependence were determined using criteria commensurate with the DSM-IV-TR. Overweight and obesity were defined as a body mass index of 25.0 to 29.9 and greater than or equal to 30.0 kg/m2, respectively.

Results: The total sample comprised 36,984 individuals (>= 15 years old) screening positive for a lifetime manic episode. Subgroup analysis indicated that overweight/obese bipolar individuals had a significantly lower rate of substance dependence than the normal weight sample (13% vs. 21%, p < .01). Conversely, bipolar individuals who screened positive for substance dependence had a lower rate of overweight/obesity when compared with non-substance-dependant bipolar respondents (39% vs. 54%, p < .01). The inverse association between the presence of these 2 comorbid conditions in bipolar I disorder continued to be statistically significant in multivariate analysis (OR = 0.57, 95% CI = 0.34 to 0.95, p < .05).

Conclusions: An inverse relationship between the presence of comorbid overweight/obesity and substance use disorders was observed in bipolar I disorder. These results suggest that comorbid addictive disorders (i.e., substance use and compulsive overeating) may compete for the same brain reward systems.