These are some newer studies:
“The caffeinated coffee did a much better job that the decaffeinated coffee in all of the studies.”
Caffeine is a stimulant that has been linked to lower weight and faster metabolism – two key factors in diabetes risk.
“The people [in the study] who were drinking more of the coffee were thinner, which is huge in lowering your risk for diabetes,” he said. “The fact that the coffee drinkers had a low BMI was likely the major reason for their lower risk.”