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A startling thought has struck me. How do we know we need to eat?

Consider this, an early human standing in the plains. Trees lions
elephants fruits and stuff. He feels odd, dizzy, tired. What instinct
causes him to pick something to put into his mouth and chew?

In a lab, a human who has had intravenous feeding for 6 years since
birth. Put into a room. Apple leaf cat and dog with him. Soon he gets
hungry. What would he do?
Man bites dog?
Man bites leaf?

Would he even know to bite and chew?

Nature va nurture.

My brain has exploded.



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