Mixed
Long-term consumption of coffee (regular or decaffeinated) and total caffeine is associated with a statistically significant reduction in the risk of developing type 2 diabetes mellitus.
If you currently drink coffee, continuing or moderately increasing your intake (up to 6+ cups/day) is associated with a significantly lower risk of developing type 2 diabetes. This benefit applies to both regular and decaffeinated coffee, suggesting factors beyond caffeine (like magnesium and antioxidants) contribute. However, do not start drinking coffee if you do not currently consume it solely for diabetes prevention; the observational nature of the evidence means causality is not proven, and individual tolerance to caffeine varies.
These data suggest that long-term coffee consumption is associated with a statistically significantly lower risk for type 2 diabetes.
Why this rating
Large prospective cohort studies (HPFS and NHS) with long follow-up and rigorous adjustment for confounders, but observational design prevents causal proof.
Source
Coffee Consumption and Risk for Type 2 Diabetes Mellitus
Eduardo Salazar-Martı́nez et al. · Annals of Internal Medicine · 2004
DOI 10.7326/0003-4819-140-1-200401060-00005
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