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Some cohort studies have indicated that drinking caffeinated or decaffeinated coffee decreases the risk for diabetes (see JWWH Jul 20 2006). To explore the association further, these researchers analyzed a subset of data from a California longitudinal study of heart disease risk factors.
Nine hundred ten adults (average age at baseline, 66 years; 59% women) were followed for up to 11 years (mean, 8.3 years) for incident type 2 diabetes. All were free of diabetes at baseline; 593 had normal 2-hour oral glucose tolerance test results, and 317 had impaired glucose tolerance. In models adjusted for age, sex, exercise, BMI, smoking, daily alcohol use, hypertension, and impaired glucose tolerance, both past and current coffee drinking were signifi…