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 or tea drinking and risk of type 2 diabetes have reported similar negative associations.

In a 2009 meta-analysis, similar statistically significant negative associations were found for the consumption of decaffeinated coffee and tea and risk of type 2 diabetes6.

A French study9 and a large US study with African-American women11, also looked at the association for decaffeinated coffee. One of the two studies confirmed an association9; the other did not see a correlation11. Additionally, a 2014 review 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 observed19.

Five of the epidemiological studies also looked at tea consumption7,8,10,11,12. Two confirmed the negative association8,12. The other three did not observe an association for tea consumption7,10,11.

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