A new study reveals that coffee may lower the suicide risk in both men and women by 50 percent. Researchers at the Harvard School of Public Health compared the risk of suicide for adults who drank two to four cups of caffeinated coffee per day with non-coffee drinkers, who consumed less coffee per day and those who chose decaffeinated. The study included more than 200,000 subjects observed during a 16-year period. Incidentally, Harvard researchers found back in 2011 that women who drank coffee showed a 15 percent reduced risk of having depression in comparison to non-coffee consumers.