We were built for gluttony. It’s a hedge against times of scarcity. Stumbling across a rare bounty, those who could stuff themselves the most to build up the greatest reserves would be most likely to pass along their genes. You might say it was the survival of the fullest. So we are hardwired to eat not just until our stomachs are full but also until our entire digestive tracts are occupied. Only when our brains sense food all the way at the end of our lower intestines may our appetites dial down fully.
