Long sleep duration predicts a higher risk of obesity in adults: a meta-analysis of prospective cohort studies.

Authors:
Wenjia Liu
Wenjia Liu
Fourth Military Medical University
China
Rui Zhang
Rui Zhang
Cancer Hospital of China Medical University
Houston | United States
Anran Tan
Anran Tan
School of Health Sciences
Garden Grove | United States
Bo Ye
Bo Ye
Zhejiang University
Xinge Zhang
Xinge Zhang
Nankai University
China
Yueqiao Wang
Yueqiao Wang
Henan University
China
Yuliang Zou
Yuliang Zou
the First Hospital of Xi'an Jiaotong University
China
Lu Ma
Lu Ma
West China Hospital
Nanchong Shi | China

J Public Health (Oxf) 2018 Aug 13. Epub 2018 Aug 13.

Department of Family & Community Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, USA.

Background: The connections between long sleep duration and obesity or weight gain warrant further examination. This meta-analysis aimed to evaluate whether long sleep duration was associated with the risk of obesity, weight gain, body mass index (BMI) change or weight change in adults.

Methods: PubMed, Embase, Cochrane Library, Elsevier Science Direct, Science Online, MEDLINE and CINAHL were searched for English articles published before May 2017. A total of 16 cohort studies (n = 329 888 participants) from 8 countries were included in the analysis. Pooled relative risks (RR) or regression coefficients (β) with 95% confidence intervals (CI) were estimated. Heterogeneity and publication bias were tested, and sensitivity analysis was also performed.

Results: We found that long sleep duration was associated with higher risk of obesity (RR [95% CI] = 1.04 [1.00-1.09], P = 0.037), but had no significant associations with weight gain, BMI change or weight change. Long sleep duration increased the risk of weight gain in three situations: among men, in studies with <5 years follow-up, and when sleep duration was 9 or more hours.

Conclusions: Long sleep duration was associated with risk of obesity in adults. More cohort studies with objective measures are needed to confirm this relationship.

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August 2018
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