Associations between bipolar disorder and metabolic syndrome: A review.
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OBJECTIVES: To examine the pathophysiologic mechanisms that may link bipolar disorder and metabolic syndrome and to discuss whether the consequences of metabolic syndrome underlie a substantive portion of the premature morbidity and mortality observed in persons with bipolar disorder. DATA SOURCES: A MEDLINE search, citing articles from 1966 onward, supplemented by a review of bibliographies, was conducted to identify relevant studies. Bipolar disorder, mood disorder, metabolic syndrome, diabetes, cardiovascular illness, and obesity were used as keywords. Criteria used to select studies included (1) English language, (2) published studies with original data in peer-reviewed journals, and (3) studies that confirmed the nature of the mood disorder examined. RESULTS: Ninety-seven studies met criteria and were reviewed for evidence of dysregulation in various physiologic systems. Bipolar disorder and metabolic syndrome share features of hormonal, immunologic, and autonomic nervous system dysregulation. CONCLUSION: Lifestyle features may account, in part, for the premature mortality observed in bipolar disorder, but the somatic correlates of the illness may also predispose patients to metabolic syndrome and the consequent increased risk of diseases such as diabetes and vascular disease.
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