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 associations2,5,17.

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 (but not decaffeinated) coffee consumption was much more protective against diabetes in women of all ethnic groups than in men, where the effect was smaller24.

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