Coffee Cuts Risk of Prostate Cancer Six cups a day means 60% lower risk for men: Study By John Johnson, Newser Staff Posted May 18, 2011 2:15 PM CDT 9 comments Comments Drinking coffee cuts the risk of prostate cancer, a new study suggests. (Shutterstock) (Newser) – Something for men to smile about over the morning cup of joe: A major study says guys who drink a lot of coffee have a much lower chance of getting the deadliest form of prostate cancer, reports NPR. Specifically, the Harvard study found that men who drank six or more cups a day (regular or decaf) had a 60% lower risk of getting lethal prostate cancer compared to those who drank little or none. Those who drank three cups a day had a 30% lower risk. "Coffee has a lot of different biological effects and several of them seem like they might be relevant for prostate cancer," says the lead author of the study, which tracked nearly 50,000 men over 20 years, notes CNN. "It's an important source of antioxidants and also has positive effects on glucose metabolism and insulin levels, and it's thought that insulin plays a role in the progression of prostate cancer."