 way up high, yeast find it more difficult to thrive in a low or anaerobic without oxygen. They do survive, but they find it more difficult the higher you go. Go up to the mountains, get a little snow time in, skiing time, and see if within three or four days you don't feel like a million bucks even after you've had a no-no on the Kauffman diet, which would be a glass of wine, because you're out of that mold. You're not inhaling it again.