Like hell there's not. It's BOTH unethical AND unreasonable. But trust some relativist psycho(logist) to completely ignore that reality.
It's true that, in the most extreme circumstances, humans have resorted to cannibalism to survive. But even then, the act is so tainted that many would prefer to starve if that was their only other option.
Not even muslimes eat their own. And that is about as primitive and barbaric a people as the earth contains these days.
Well in the Pacific Islands the tradition was to eat one’s enemies. But they made one huge mistake. You should never eat the liver of a predator, because that’s where all the poisons are stored, but that’s exactly what they would do, eat the liver. Fa-fa-fa-fa-fa