I wonder about this a lot, this is why I avoid wearing the same underwear after farting a lot. You can feel the underwear a bit wet and humid after farting a lot, even if there was no poop. Better to always wash your arsehole with a faucet water head and soap, and farting mostly on a toilette.
Are shit perticles a legitimate threat during farting sessions? I fart a lot but shitting myself is a rare event, upon inspection I seldom notice anything brown on the anal part of my underwear. Hence I wonder if tons of fecal nanoparticles unnoticeable to an eye are still released onto my pants as I fart.
Beans, lentils, onions, or the cabbage contain a lot of oligosaccharides. These are ans type of sugar that can't properly traverse the gut wall because the molecule is too big. Hence, this sugar stays in your gut and is then eaten by gut bacteria which produces a lot of gas.
You can buy pills that contain ans enzyme called alpha-galactosidase which helps break down the oligosaccharides into smaller parts that can be properly digested by you. Then you don't have to fart that much anymore.
This is my area of expertise actually.
tl:dr; yes, you are shitting out microparticles of shit.
So, let's talk about smell. Smells are from odorants, which are molecules which elicit the "smell". For an odorant to be perceived by the nose, it has to make physical contact with the receptor to then trigger the perception of "I smell this".
ANYTHING you smell, you are inhaling the actual substance, albeit in small amounts.
>but bernd, I smell only farts, not shit!
You really think that the shit that's smearing against your intestines and sphincter and whatever else, that requires you to wipe up with toilet paper / shower clean because it sticks, somehow doesn't have a single particle that comes loose when forceful air whistles by? lol