Yeast are microscopic, single-celled fungi, and Koch's explanation is that they break down some of the alcohol in the stomach before it gets absorbed in the bloodstream. "It mitigates the effect of alcohol," he says. ... Yeast has an enzyme, just like our own livers and stomach linings, that can break down alcohol.

Does yeast keep you from getting drunk?

Ingesting baker's yeast prior to drinking is unlikely to reduce blood alcohol levels or make you less intoxicated. ... In the case of Jim Koch, he likely drinks with enough frequency that his body his increased levels of one of the enzymes that metabolizes alcohol.

What stops you from getting drunk?

Spacing out your drinks can stop you from getting drunk. Try leaving a certain amount of time between drinks (e.g. an hour), and making sure the time has passed before you get a new drink. Just got a delish craft beer? Savour it by drinking it more slowly.