Why eating a lot feels so darn good - CNN.com
Evolution has given us the instinct to eat a lot every time we can, preparing for hard times. It's the drive to survive, like puffy-cheeked squirrels storing up for the winter. It's also fueled by competition: beating the others to the food.
Our brains reward us for it, by releasing pleasure chemicals -- in the same way as drugs and alcohol, experts say.
Scientists studying that good feeling after eating call it ingestion analgesia, literally pain relief from eating.
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