Long-term effects of coffee and caffeine intake on the risk of pre-diabetes and type 2 diabetes: Findings from a population with low coffee consumption

Published:September 11, 2018DOI:


      • We assessed the possible associations of coffee and caffeine with the risk of diabetes and pre-diabetes.
      • A lower risk of pre-diabetes and diabetes was observed in coffee drinkers compared to non-drinkers.
      • Higher intake of caffeine (≥152 vs. <65 mg/d) was accompanied with a significant reduced risk of pre-diabetes.


      Background and aim

      Here, we examined the potential effect of coffee consumption and total caffeine intake on the occurrence of pre-diabetes and T2D, in a population with low coffee consumption.

      Methods and Results

      Adults men and women, aged 20–70 years, were followed for a median of 5.8 y. Dietary intakes of coffee and caffeine were estimated using a 168-food items validate semi-quantitative food frequency questionnaire, at baseline. Cox proportional hazards regression models, adjusted for potential cofounders, were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for the association between coffee and caffeine intakes and incidence of pre-diabetes and T2D. The total population was 1878 adults (844 men, 1034 women) and 2139 adults (971 men, 1168 women) for analysis of pre-diabetes and T2D, respectively.
      During the follow-up period the incidence of pre-diabetes and T2D was 30.8% and 6.6%, respectively. Forty-three percent of our subjects were no coffee drinker whereas 51.4% consumed 1 cup of coffee/week and 6.0% consumed more than 1 cup of coffee/week. A lower risk of pre-diabetes (HR = 0.73, 95% CI = 0.62–0.86) and T2D (HR = 0.66, 95% CI = 0.44–1.00) was observed in coffee drinkers compared to non-drinkers, in the fully adjusted models. Higher dietary intake of caffeine (≥152 vs. <65 mg/d) was accompanied with a borderline (P = 0.053) reduced risk of pre-diabetes (HR = 0.45, 95% CI = 0.19–1.00).


      Our findings indicated that coffee drinking may have favorable effect in prevention of pre-diabetes and T2D.


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