Decaffeinated coffee and tea and risk of type 2 diabetes

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As with caffeinated coffee, the majority of published studies that have evaluated the relationship between decaffeinated coffee and risk of type 2 diabetes have reported similar inverse associations2,8,17.

A 2014 meta-analysis of prospective studies concluded that in addition to an effect with caffeinated coffee, an 11% reduction for every 2 additional cups of decaffeinated coffee a day was also observed16.

A French study5 and a large US study with African-American women7 also looked at the association for decaffeinated coffee. One of the two studies confirmed an association5; the other did not see a correlation7. A multiethnic cohort study suggested that caffeinated  coffee consumption was much more protective against diabetes in women of all ethnic groups than in men, where the effect was smaller; this finding did not apply to decaffeinated coffee27. Further investigation on this matter is required.

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