People taking blood-thinning medications have been told in the past to limit their vitamin K intake. Some researchers now say that may not be the best advice. Patients taking blood-thinning drugs such as warfarin are told by doctors to reduce their intake of vitamin K because it’s believed too much of this vitamin can decrease the drug’s effectiveness. This is due to the belief that the vitamin interacts with the body’s clotting process and can interfere with the drug’s blood-thinning properties. But what if this advice is wrong? According to a new clinical trial, people taking these drugs should actually...