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Beer Gut: Man’s Belly Brews Own Beer

Free beer might sound like heaven to some tailgaters on this football weekend, but consider the case of a man whose tummy was fermenting its own brew.

Suspected for five years of being a “closet drinker,” the 61-year-old man showed up in 2009 at a Texas emergency room with a blood alcohol concentration of 0.37 percent—despite not having a drop of alcohol.

Brewer's yeast
Brewer’s yeast (Saccharomyces cerevisiae), seen in a false color electron microscope image, with budding daughter cells (green). Image from Eye of Science/Science Source

“He would get drunk out of the blue,” nursing dean Barabara Cordell of Panola College in Carthage, Texas, told NPR’s  “the salt” food blog. The man’s wife, a nurse, purchased a breathalyzer and found that (often after exercise or not eating) his blood-alcohol level was regularly four to five times the U.S. legal limit of 0.08 percent. (Explore a human-body interactive.)

In April of 2010, Cordell and her colleague Justin McCarthy report in a recent International Journal of Clinical Medicine, the man checked in for 24-hour observation at a hospital, where his bags were searched for booze and he was fed high-carbohydrate snacks during the day. In the afternoon of the stay, his blood alcohol level rose to 0.12 percent.

The culprit was gut fermentation syndrome, also known as auto-brewery syndrome. The man had been a home-brewer of beer and likely was regularly exposed to the brewer’s yeast, Saccharomyces cerevisiae, the fungus used to ferment beer. He probably acquired his own private brewery in 2004 after antibiotics treatment killed off his original intestinal flora and replaced it with brewer’s yeast. (Watch a video on the science of brewing.)

Thereafter, after eating carbohydrate-rich foods such as bread or bagels, the gut bugs would ferment away, merrily making an alcohol-rich brew in the man’s innards in the next 24 hours.

The story has a happy ending; the man took daily anti-fungal medications for six weeks to kill off the brewer’s yeast. During his recovery, he also had to follow “a very strict no sugar, no carbohydrate diet and did not ingest alcohol in any form,” says the study.

After years of involuntary inebriation, the last part of the treatment may have come as a relief.

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  1. Aashim
    September 25, 2013, 8:40 am


  2. Genevieve Humphreys
    September 24, 2013, 5:09 pm

    It Is called Systemic Candida. Many People Have It.

  3. Sherlock
    September 23, 2013, 9:16 pm

    But what should he do when polices are waiting for driver testing?

  4. bob
    September 23, 2013, 8:08 pm


  5. Somedude
    September 23, 2013, 5:38 pm

    Why would you want to cure that?? Free beer for life! Dude!

  6. Ima Ryma
    September 23, 2013, 3:57 am

    I am an animal house bro
    In a college fraternity.
    Medical tests on me did show
    I am an auto brewery.
    Somehow a yeast fungus got in
    My tummy, and made me ferment
    Real beer bellied under my skin.
    My frat bros thought this heaven sent.
    “It’s party time,” the bros cheered out,
    “We have got a bunch of free beer!”
    I felt my tummy twitch – no doubt,
    The bros intentions were not clear.

    I thought they were pulling my leg,
    But then they tapped me like a keg.

  7. Toni
    September 22, 2013, 11:44 am

    That is sooo weird!

  8. Michael Miles
    Victoria BC
    September 21, 2013, 2:37 pm

    I am shocked that the Corporations did not sue for patent infringement.