[Eli5] How did ancient (like very ancient) humans know they have to eat? Is it “programmed” into us from birth?
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Babies learn an oral fixation almost immediately. Babies who don’t learn to scream when they’re hungry and suckle on literally everything for nourishment often died. Many Babies died from stuffing rocks and poisonous bugs in their mouths, but it was still better to instinctually want to eat everything than not to. Old babies (adults) learned from their mothers and personal experience to stop eating live stinging bugs. Learning is still a mystery.
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