The objective of this prospective study was to examine the association between coffee, tea and alcohol consumption and the risk of type 2 diabetes. The study sample from the Black Women’s Health Study included 46,906 participants aged 30-69 years at baseline. A total of 3,671 incident cases of type 2 diabetes were documented during the 12-year follow-up. Results revealed that higher intakes of caffeinated coffee and alcohol were each associated with a decreased risk of type 2 diabetes. In contrast, there was no evidence of an association between consumption of decaffeinated coffee or tea and risk of diabetes overall. More specifically, consumption of ≥2 cups of coffee/day was associated with 18% reduction in diabetes risk compared to no coffee intake. Moreover, an inverse association was observed between moderate alcohol intake (≥4 drinks/week) and risk of diabetes represented by a 32% reduction in risk. These results suggest that moderate intake of caffeinated coffee and alcohol reduce the risk of type 2 diabetes in African-American women.
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