Effects of 16-week consumption of caffeinated and decaffeinated instant coffee on glucose metabolism in a randomized controlled trial.

The adjusted mean percent changes of AUC glucose were −4.5% (95% CI −10.5 to 2.0) for caffeinated coffee, −7.6% (95% CI −14.6 to −0.1) for decaffeinated coffee, and 2.2% (95% CI −4.8 to 9.7) for control (overall P = 0.14); a pooled percent decrease in the two coffee groups was nearly significant as compared with the noncoffee group ( P = 0.053). 3.3.

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