Background: Several epidemiological studies have found that the prevalence of bipolar disorder (BD) is significantly higher in obese population than non-obese population. However, no meta-analysis has been published to quantitatively summarize the related literature.
Methods: In this study, we conducted a meta-analysis to explore the association between obesity and BD by combining 9 cross-sectional studies with a total of 12,259 BD cases and 615,490 non-BD controls. The meta-analysis was performed using the effect estimates and 95% confidence intervals (CIs) to calculate the pooled odds ratio (OR), while the heterogeneity was assessed using I(2) and Q statistic.
Results: Our meta-analysis suggests that obesity is associated with increased prevalence of BD by a random-effect model (OR=1.77, 95% CI: 1.40-2.23; Q=44.62, P<0.001, I(2)=82.1%).
Limitation: Without prospective studies, we cannot determine whether obesity increased the risk of developing BD or vice-versa.
Conclusion: Obesity is positively associated with BD.
Keywords: Bipolar disorder; Meta-analysis; Obesity.
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