FILE - In this Friday, Feb. 6, 2009 photo, the owner of a coffee shop serves cappuccinos to judges during a barista competition in Cranberry, Pa. Scientists have long known that one's genes influence how much of coffee one consumes, and a study released Tuesday, Oct. 7, 2014 by the journal Molecular Psychiatry has identified some genes that may play a role. Their apparent effect is quite small. But variations in these genes may modify coffee’s effect on a person’s health, and so such genetic research may help scientists explore that, said Marilyn Cornelis of the Harvard School of Public Health. (AP Photo/Keith Srakocic)

DNA linked to how much coffee you drink

Scientists have long known that your DNA influences how much java you consume. Now a huge study has identified some genes that may play a ro…