You should ease up on the fake sugar
Sure, you save on calories, but for some, our systems simply can’t tolerate artificial sweeteners—such as sorbitol, mannitol, and xylitol; plus, they contain sugar alcohols, which can cause farts and bloating.
Your sphincter is tight
It seems wrong to put “butthole” in bold, but that’s what the sphincter is; and its tightness, plus the speed at which the gas passes through it, determines the volume and pitch of your toot. And if your farts smell like rotten eggs, it’s probably because you ate something with sulphur in it. Most of the gas we release is an odourless mix of carbon dioxide, oxygen, nitrogen, hydrogen and sometimes methane. However, when bacteria breaks down beans, cabbage, meat and other high-sulphurous foods, it creates a tiny amount of sulphur compounds that give off a Napoleon-complex smell.