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Meta-analysis

Caffeinated and Decaffeinated Coffee Consumption and Risk of Type 2 Diabetes: A Systematic Review and a Dose-Response Meta-analysis

  1. Ming Ding1,
  2. Shilpa N. Bhupathiraju1,
  3. Mu Chen1,
  4. Rob M. van Dam1,2 and
  5. Frank B. Hu1,3,4⇑
  1. 1Department of Nutrition, Harvard School of Public Health, Boston, MA
  2. 2Saw Swee Hock School of Public Health and Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore
  3. 3Department of Epidemiology, Harvard School of Public Health, Boston, MA
  4. 4Channing Division of Network Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA
  1. Corresponding author: Frank B. Hu, nhbfh{at}channing.harvard.edu.
Diabetes Care 2014 Feb; 37(2): 569-586. https://doi.org/10.2337/dc13-1203
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Abstract

OBJECTIVE Previous meta-analyses identified an inverse association of coffee consumption with the risk of type 2 diabetes. However, an updated meta-analysis is needed because new studies comparing the trends of association for caffeinated and decaffeinated coffee have since been published.

RESEARCH DESIGN AND METHODS PubMed and Embase were searched for cohort or nested case-control studies that assessed the relationship of coffee consumption and risk of type 2 diabetes from 1966 to February 2013. A restricted cubic spline random-effects model was used.

RESULTS Twenty-eight prospective studies were included in the analysis, with 1,109,272 study participants and 45,335 cases of type 2 diabetes. The follow-up duration ranged from 10 months to 20 years. Compared with no or rare coffee consumption, the relative risk (RR; 95% CI) for diabetes was 0.92 (0.90–0.94), 0.85 (0.82–0.88), 0.79 (0.75–0.83), 0.75 (0.71–0.80), 0.71 (0.65–0.76), and 0.67 (0.61–0.74) for 1–6 cups/day, respectively. The RR of diabetes for a 1 cup/day increase was 0.91 (0.89–0.94) for caffeinated coffee consumption and 0.94 (0.91–0.98) for decaffeinated coffee consumption (P for difference = 0.17).

CONCLUSIONS Coffee consumption was inversely associated with the risk of type 2 diabetes in a dose-response manner. Both caffeinated and decaffeinated coffee was associated with reduced diabetes risk.

Footnotes

  • This article contains Supplementary Data online at http://care.diabetesjournals.org/lookup/suppl/doi:10.2337/dc13-1203/-/DC1.

  • Received May 22, 2013.
  • Accepted September 27, 2013.
  • © 2014 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

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Diabetes Care: 37 (2)

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February 2014, 37(2)
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Caffeinated and Decaffeinated Coffee Consumption and Risk of Type 2 Diabetes: A Systematic Review and a Dose-Response Meta-analysis
Ming Ding, Shilpa N. Bhupathiraju, Mu Chen, Rob M. van Dam, Frank B. Hu
Diabetes Care Feb 2014, 37 (2) 569-586; DOI: 10.2337/dc13-1203

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Caffeinated and Decaffeinated Coffee Consumption and Risk of Type 2 Diabetes: A Systematic Review and a Dose-Response Meta-analysis
Ming Ding, Shilpa N. Bhupathiraju, Mu Chen, Rob M. van Dam, Frank B. Hu
Diabetes Care Feb 2014, 37 (2) 569-586; DOI: 10.2337/dc13-1203
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