http://www.sciencemag.org/news/2019/09/microbe-got-man-drunk-could-help-explain-common-liver-disease

Some strains of Klebsiella pneumoniae in the gut can turn starchy and sugary foods into alcohol.

A man in China who, after eating high-carbohydrate or sugary meals, became so intoxicated that he blacked out, has led researchers to discover strains of bacteria in the human gut that could be an important driver of the world’s most common liver disease.