What effect does decaffeinated coffee have on the risk of developing type 2 diabetes?

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Interestingly, 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 associations3,6-8.

In fact, 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 observed6.

Two specific studies both published in 2010 – a French study18 and a large US study with African-American women19 – also looked at the association between type 2 diabetes and decaffeinated coffee. While the French study confirmed an association18, the US one did not report a correlation19.

And a multi-ethnic cohort study, in 2014, which also considered the effects of gender on the caffeine/type 2 diabetes association, suggested that caffeinated coffee consumption was much more protective against diabetes in women of all ethnic groups than in men (where the effect was present but smaller); but also that this finding did not apply to decaffeinated coffee20.

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