intestines

That's a very misleading statement, the body is able to significantly reduce the amount of iron absorption through the intestines.

This means that they're counting the weight of non-eaten tissue (bones, skin, intestines, brains, etc).

If food is being left behind undigested in your intestines please get off the internet and see a doctor!!!

Your body is digesting food that remained in your intestines and also fat deposits.

Undigested food does not stay in your intestines and neither does any toxins.

Fibers (very long/complex carbonhydrates) actually retard the intestines ability to process simpler carbonhydrates.

IV antibiotics can reach your gut - some are excreted into the intestines.

Don't forget we still don’t actually know all of the bacteria thrive in the human intestines.

The mess of evolution has left us with intestines and behaviours that will generally keep us alive for as long as possible under most circumstances.

Or, different foods have different molecular structure, which is digested and metabolized by different pathways in your stomach and intestines, leading to different aromatic by-products.

Pajata [1] is unweaned veal intestines, and contain a cheese-like substance.

Sugar alcohols in particular are indigestible, so eating too many will make your intestines unhappy with you… On the other hand, they apparently _heal_ cavities instead of causing them.

The thing my Texan friend said was a joke: "You know, Muslims invented the condom from animal intestines..

But the English improved it by removing the intestines from the animal before using them".

Colloquial modern Mandarin Chinese uses a few words for the same, chiefly 肠 (cháng; to do with "intestines" or "digestive innards"), 胃 (wèi; "stomach"), 肚子 (dùzi; "belly" or "abdomen").