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Old 10-27-2012, 04:01 AM   #1
KuntzBrewing
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Has anyone come up with a good reason for this? I've got a good hypothesis on it. Yeast enjoy acidic environments and temperatures around 100 degrees (this is the temp wyeast uses to grow yeast although this is a terrible temp to pitch or ferment at) I'm thinking that the stomach and colon make the perfect environment for yeast to thrive for a short time, during this time they make tons of gas by eating broken down sugars from our foods until dying in the colon. This gas causes terrible but distinct beer farts.



 
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Old 10-27-2012, 04:09 AM   #2
AndrewD
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I've never really noticed this problem, but my beer probably doesn't have a lot of yeast in it by the time I drink it.



 
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Old 10-27-2012, 04:16 AM   #3
KuntzBrewing
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Even from craft beers? I get it from these too, but I have noticed that you can build a tolerance, but I've cut my drinking lately so I notice it more now lol I used to never notice

 
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Old 10-29-2012, 06:03 AM   #4
Fantastical
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I seem to usually have a lot of gas but not usually of the stinky variety.

 
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Old 01-27-2013, 05:30 PM   #5
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I have read that most farts are due to air ingested while eating or drinking. that said, beer has usually more than one volume of CO2, which is why it foams...all that has to get out somehow. so if you are drinking highly carbonated beer, expect more farts. A friend of mine had a real problem with this until he switched to not carbing his beers, but switched to nitrogen to push the beer out of the keg. You still get foam and there is after all some CO2 still in solution from fermentation, but he has not suffered from beer farts ever since. your mileage may vary...

 
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Old 01-27-2013, 06:35 PM   #6
looneybomber
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I believe I burp out most of the CO2 I injest. That said, PBR in larger quantities gives me more than just beer farts the next morning...I hope YMMV.
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Old 01-27-2013, 06:39 PM   #7
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It's not as much the yeast as the oligosaccharides (long chain sugars) left in your beer.

Your digestive track gives those sugars an extra spin.

It's why homebrew farts are more prevalent from large, complex beers, and why filtered commercial beers don't really do much.

And unfiltered simple, clean beers (commercial or homebrews) have plenty of yeast and rarely ellicit that reaction.

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Old 01-27-2013, 07:09 PM   #8
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One final item that nobody ever remembers to tell new brewers until it's too late is: "Don't drink the yeast layer on the bottom of the bottle." People will say, "My first homebrew was pretty good, but that last swallow was terrible!" or "His homebrew really gave me gas" or "It must have been spoiled, I had to go to the bathroom right away after I drank it." Welcome to the laxative effects of live yeast!

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Old 01-28-2013, 01:05 AM   #9
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It's beer's way of telling you that you need a healthier diet. heh
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Old 01-28-2013, 02:14 PM   #10
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Once your system becomes accustomed to homebrew they will taper off and you will not get them as badly. I find I get them worse from cheaper commercial brews now. Now, if we could only come up with a way to trap the Toxic Green Gasses and turn them into fuel for our burners I would be set.



 
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