You know when you were little and your belly growled and you asked “Why?” And mum and dad patiently answered “Because you're hungry”?
I think they didn't know either. Maybe not even the first that gave himself that answer knew, almost it were a myth to explain the noises in the stomach, not even him knew that there is That.
What exactly *is* That? You'll ask. Nothing, it's just That. That is in your stomach and needs to assorb organic material.
I'll try to explain in a simple way: if there wasn't That inside of you, you wouldn't ever be hungry. Humans themselves don't feel hungry, it's that That grows inside their stomach while they're still fetus.
You can't see it, it's tiny tiny, so it can't be removed.
Well, and so? You'll ask. In effect it isn't that great discover that a tiny thing lives inside your stomach asking sometimes any form of organism, animal or vegetable, alive or dead. Actually it seems one of those stupid cute tales your parents tell you, like