Originally posted by: BlancoNino
Originally posted by: CarlKillerMiller
Originally posted by: BlancoNino
Originally posted by: Aflac
No...
the yeast is undergoing anaerobic respiration, creating carbon dioxide and alcohol as a result of breaking down sugars/starches.
But they are essentially peeing and farting!
What? No, they're not. I don't even get what you mean by "essentially", here.
If you would use your imagination a little...it's pretty much the same process.
Imagination != LSD-induced hallucination
You want an explanation? Well here you go.
In the brewing process, yeasts take in starches/sugars, and since they're in an environment without oxygen, undergo anaerobic respiration. The by-products of this anaerobic respiration are carbon dioxide, ethyl alcohol, and energy to be used by the yeast.
This is akin to humans when they are doing aerobic exercise (distance running, distance swimming, basically anything that takes a long time and your body is constantly working). In this case, the human body cannot take in oxygen fast enough to satiate the need for energy, so instead of going through the process that uses oxygen, the body changes to the one that doesn't use oxygen. It takes stored-up sugars and starches, breaks them down, and the by-products of this are lactic acid and energy.
In both cases, respiration occurs without oxygen. In one case, carbohydrates are turned into alcohol, while in the other case, carbohydrates turn into lactic acid (which is what makes your muscles burn after a while). Both are essentially the same process, and perform the same function.
This is NOT pissing and farting.
The correct analogy would be "did you know that when making beer, the yeast is breathing?"
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