I feel I should point out that the live yeast continues to create carbonation as long as there is sugar, which includes in your gut. Yes, yeast carbonated soda makes you fart WAY more than that done with a carbonator. Husband used to make it and we had very vivid proof of that. (husband may have been pitching too much yeast; I don't know. I just know one couldn't drink it before going anywhere where one would be around people. Or small animals. Or plants, for that matter)