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Diabetologia. 2014 Jul;57(7):1346-54. doi: 10.1007/s00125-014-3235-7. Epub 2014 Apr 26.

Changes in coffee intake and subsequent risk of type 2 diabetes: three large cohorts of US men and women.

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  • 1Department of Nutrition, Harvard School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA.

Abstract

AIMS/HYPOTHESIS:

Coffee and tea consumption has been associated with a lower type 2 diabetes risk but little is known about how changes in coffee and tea consumption influence subsequent type 2 diabetes risk. We examined the associations between 4 year changes in coffee and tea consumption and risk of type 2 diabetes in the subsequent 4 years.

METHODS:

We prospectively followed 48,464 women in the Nurses' Health Study (NHS; 1986-2006), 47,510 women in NHS II (1991-2007) and 27,759 men in the Health Professionals Follow-up Study (HPFS; 1986-2006). Diet was assessed every 4 years using a validated food-frequency questionnaire. Self-reported cases of incident type 2 diabetes were validated by supplementary questionnaires.

RESULTS:

During 1,663,319 person-years of follow-up, we documented 7,269 cases of incident type 2 diabetes. Participants who increased their coffee consumption by more than 1 cup/day (median change = 1.69 cups/day) over a 4 year period had an 11% (95% CI 3%, 18%) lower risk of type 2 diabetes in the subsequent 4 years compared with those who made no changes in consumption. Participants who decreased their coffee intake by more than 1 cup/day (median change = -2 cups/day) had a 17% (95% CI 8%, 26%) higher risk for type 2 diabetes. Changes in tea consumption were not associated with type 2 diabetes risk.

CONCLUSIONS/INTERPRETATION:

Our data provide novel evidence that increasing coffee consumption over a 4 year period is associated with a lower risk of type 2 diabetes, while decreasing coffee consumption is associated with a higher risk of type 2 diabetes in subsequent years.

PMID:
24771089
[PubMed - indexed for MEDLINE]
PMCID:
PMC4115458
Free PMC Article
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