[Eli5] How did ancient (like very ancient) humans know they have to eat? Is it “programmed” into us from birth?
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Humans have very few real instinctual behaviors, suckling is one of them. Past that you have to remember that no one just flipped a switch and said “ok ape, you’re a human now” and that our behaviors are built up from generations of watching our parents and things around us. The thing that keeps me alive put food in my mouth and eating felt good. They learned it from whatever birthed them, and so forth going back to when we were little pre-human critters
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