Research based on 200 previous studies worldwide says that people consuming three to four cups of coffee a day are less likely to get diabetes, heart disease, dementia and some cancers except for women who are pregnant or who have a higher risk of suffering fractures. Coffee was also associated with a lower risk of several cancers, including prostate, endometrial, skin and liver cancer, as well as type-2 diabetes, gallstones and gout, the researchers said. The greatest benefit was seen for liver conditions such as cirrhosis of the liver.