A 61-year-old man found himself getting drunk without ever drinking alcohol because he had brewer's yeast in his gut. Basically, whenever he ate any carbs, the man's intestinal tract would start turning that into beer and make him drunk. He had a brewery in his belly. The man had been recorded with a 0.37 BAC level without drinking at all, or almost five times the legal limit for driving in Texas.The patient had an infection with Saccharomyces cerevisiae, Cordell says. So when he ate or drank a bunch of starch — a bagel, pasta or even a soda — the yeast fermented the sugars into ethanol, and he would get drunk. Essentially, he was brewing beer in his own gut. Cordell and McCarthy reported the case of "auto-brewery syndrome" a few months ago in the International Journal of Clinical Medicine.