wine

Well. A huge number of observational studies have now been performed in real living humans, finding that people who drink wine more have more breast cancer. They have included careful analyses, in which they try to account perhaps imperfectly for other possible explanations for this relationship. These studies have even been collected together in a systematic review, and a meta-analysis, where all the figures are run onto one big spreadsheet, and they estimate that overall, half a glass of red wine a day increases your risk of breast cancer by 10%. If their figures are correct, alcohol causes about 6% of all breast cancer in the UK, meaning 2,500 cases a year."

"Which means that, in concluding that red wine could prevent cancer, but i can't find existing evidence that arrives at the opposite conclusion."