What makes coffee research so confusing is that a lot of it is actually caffeine research. You see, researchers love isolating whole food constituents to avoid confounding variables. It’s easier to get a definitive result about caffeine than it is to get one about coffee, because coffee contains huge and diverse levels of antioxidant compounds. If you don’t, and coffee has a health effect, how do you know if it’s the caffeine or something else in coffee causing the effect? That’s helpful, but most of us are drinking coffee – not popping caffeine pills. So, while caffeine is definitely one of the main active compounds in coffee, it’s not the only one. Adjust your interpretation of “coffee” research accordingly.
Health benefits of coffee. http://burndownthefreakingmission.com