The relationship of C-reactive protein to obesity-related depressive symptoms: a longitudinal study.

Michael Daly

Obesity (Silver Spring, Md.) 2013 Feb

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Obesity has been shown to produce a state of systematic low-grade inflammation that may have detrimental neuropsychiatric effects. Longitudinal associations between obesity, inflammation, and depressive symptoms amongst a cohort of older English adults over 4 years of follow-up were examined. Participants were 3,891 obese and nonobese people drawn from the English longitudinal study of ageing (ELSA) [aged 64.9 (SD = 8.8) years, 44.6% men]. Depressive symptoms were assessed at baseline and after 4 years of follow-up using the eight-item center for epidemiological studies-depression scale (CES-D). Approximately 26.3% (N = 1,025) of the sample were categorized as obese at baseline. Obesity at baseline was associated with elevated levels of depressive symptoms at follow-up (P < 0.001), in analyses that adjusted for depression levels at baseline and sociodemographic and background variables including the prevalence of permanent illness/disability, alcohol consumption, sedentary behavior, and smoking. In addition, C-reactive protein (CRP) concentrations at baseline were independently associated with CES-D depression scores at follow-up (P = 0.008) in fully adjusted analyses. Subsequent mediation analyses revealed that CRP levels explained ∼20% of the obesity-related longitudinal change in depression scores. These data suggest that chronic inflammation may be a key determinant of depressive symptoms in obesity. Copyright © 2012 The Obesity Society.

Citation

Michael Daly. The relationship of C-reactive protein to obesity-related depressive symptoms: a longitudinal study. Obesity (Silver Spring, Md.). 2013 Feb;21(2):248-50