In other words, meat is digested by enzymes produced by our own bodies.
Meanwhile, the surface of the small intestine absorbs anything that our enzymes have broken down into sufficiently small components—usually individual amino acids, simple sugars, and free fatty acids.
Finally our ileocecal valve opens, and our small intestine releases what’s left into our large intestine— And the reason we have a bacterial colony in our colon is because our own enzymes can’t break down everything we eat.
(Keep in mind that we have not absorbed any nutrients yet: we’re still breaking everything down.) Eventually our pyloric valve opens, and our stomach releases the chyme, bit by bit, into our small intestine—where a collection of salts and enzymes goes to work.
“Humans can’t actually digest meat: it rots in the colon.” And its variant: “Meat takes 4-7 days to digest, because it has to rot in your stomach first.” (Some variations on this myth claim it takes up to two months!) Like most vegetarian propaganda, it’s not just false, it’s an inversion of truth.Nothing ‘rots’ in a vat of p H 2 hydrochloric acid and pepsin.On average, a ‘mixed meal’ (including meat) takes 4-5 hours to completely leave the stomach—so we’ve busted yet another part of the myth.
So our gut bacteria go to work and digest some of the remainder, sometimes producing waste products that we can absorb.(And, often, a substantial quantity of farts.) The remaining indigestible plant matter (“fiber”), dead gut bacteria, and other waste emerge as feces.