Researchers have identified certain gastrointestinal fungi as the pathogens that produce alcohol and are responsible for gut fermentation syndrome. Two of these intestinal yeasts are Saccharomyces cerevisiae and Candida glabrata. Auto-brewery syndrome causes an overgrowth of these yeast pathogens inside the intestines. When carbohydrates are ingested--even small amounts, in some cases--they metabolize with the produced ethanol, which triggers symptoms of intoxication. Brewer’s yeast is made from Saccharomyces cerevisiae and is collected during the process of brewing beer. Essentially, when a person has auto-brewery syndrome, the gut becomes its own brewery.
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