Abstract of a review in Critical Reviews Food Science and Nutrition.
Money Quote:
"For adults consuming moderate amounts of coffee (3-4 cups/d providing 300-400 mg/d of caffeine), there is little evidence of health risks and some evidence of health benefits."
Crit Rev Food Sci Nutr. 2006;46(2):101-23. Links
Coffee and health: a review of recent human research.
Higdon JV, Frei B.
Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA.
jane.higdon@oregonstate.edu Coffee is a complex mixture of chemicals that provides significant amounts of chlorogenic acid and caffeine.
Unfiltered coffee is a significant source of cafestol and kahweol, which are diterpenes that have been implicated in the cholesterol-raising effects of coffee.
The results of epidemiological research suggest that coffee consumption may help prevent several chronic diseases, including type 2 diabetes mellitus, Parkinson's disease and liver disease (cirrhosis and he