A new study, published on Wednesday, states that drinking alcohol produces a harmful chemical in the body which can lead to permanent genetic damage in the DNA of stem cells, increasing the risk of cancer developing. From a report: The research, using genetically modified mice, provides the most compelling evidence to date that alcohol causes cancer by scrambling the DNA in cells, eventually leading to deadly mutations. During the past decade, there has been mounting evidence of the link between drinking and the risk of certain cancers. "How exactly alcohol causes damage to us is controversial," said Prof Ketan Patel, who led the work at the MRC Laboratory of Molecular Biology in Cambridge. "This paper provides very strong evidence that an alcohol metabolite causes DNA damage [including] to the all-important stem cells that go on to make tissues." The study builds on previous work that had pinpointed a breakdown product of alcohol, called acetaldehyde, as a toxin that can damage the DNA within cells. However, these earlier studies had relied on extremely high concentrations of acetaldehyde and used cells in a dish rather than tracking its effects within the body.