Abstract
The hypothesis of metabolically healthy obesity posits that adverse health effects of obesity are largely avoided when obesity is accompanied by a favorable metabolic profile. We tested this hypothesis with depressive symptoms as the outcome using cross-sectional data on obesity, metabolic health and depressive symptoms. Data were extracted from eight studies and pooled for individual-participant meta-analysis with 30 337 men and women aged 15–105 years (mean age=46.1). Clinic measures included height, weight and metabolic risk factors (high blood pressure, high triglycerides, low high-density lipoprotein cholesterol, high C-reactive protein and high glycated hemoglobin). Depressive symptoms were assessed using clinical interview or standardized rating scales. The pooled sample comprised 7673 (25%) obese participants (body mass index ⩾30 kg m–2). Compared to all non-obese individuals, the OR for depressive symptoms was higher in metabolically unhealthy obese individuals with two or more metabolic risk factors (1.45; 95% confidence interval (CI)=1.30, 1.61) and for metabolically healthy obese with ⩽1 metabolic risk factor (1.19; 95% CI=1.03, 1.37), adjusted for sex, age and race/ethnicity. Metabolically unhealthy obesity was associated with higher depression risk (OR=1.23; 95% CI=1.05, 1.45) compared with metabolically healthy obesity. These associations were consistent across studies with no evidence for heterogeneity in estimates (all I2-values<4%). In conclusion, obese persons with a favorable metabolic profile have a slightly increased risk of depressive symptoms compared with non-obese, but the risk is greater when obesity is combined with an adverse metabolic profile. These findings suggest that metabolically healthy obesity is not a completely benign condition in relation to depression risk.
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Acknowledgements
This research was supported by the Academy of Finland (grant numbers: 124322, 124271 and 132944); the BUPA Foundation, UK; Medical Research Council (MRC, K013351); the US National Institutes of Health (R01HL036310; R01AG034454) and the Finnish Work Environment Fund. The Centre for Cognitive Ageing and Cognitive Epidemiology is supported by the Biotechnology and Biological Sciences Research Council, the Engineering and Physical Sciences Research Council, the Economic and Social Research Council, the Medical Research Council and the University of Edinburgh as part of the cross-council Lifelong Health and Wellbeing initiative. MH is supported by the British Heart Foundation (RE/10/005/28296). GDB is a Wellcome Trust Fellow. MK is an Economic and Social Research Council Professor. The study sponsors did not contribute to the study design and had no role in data collection, data analysis, data interpretation or the writing of the report.
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Jokela, M., Hamer, M., Singh-Manoux, A. et al. Association of metabolically healthy obesity with depressive symptoms: pooled analysis of eight studies. Mol Psychiatry 19, 910–914 (2014). https://doi.org/10.1038/mp.2013.162
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DOI: https://doi.org/10.1038/mp.2013.162
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