Before you pour that glass of wine, check this out – a new study says that even one alcoholic beverage a day can increase the chance of suffering a stroke. The study, from Chinese researchers and the University of Oxford, found that one or two drinks per day can raise the chance of stroke by up to 15%. Three or four drinks per day will raise the chance all the way up to 35%. Researchers say the study debunks the idea that one drink a day could actually reduce the risk of heart disease or stroke. Scientists define a drink as one glass of wine, one bottle of beer, or one shot of liquor.