Instead of piling up food in my fridge that says 'Come eat me!' I keep enough for only a couple of days. And I rarely have treats around that might tempt me late at night, which is when I usually crave something really fattening. What am I going to do? Drive out at 11 at night just to satisfy a craving? No, that's crazy.
If a situation requires sudden thought and action, the blood is promptly driven to the head. If a heavy meal is to be digested, the greater portion of the blood leaves the head, centering around the digestive organs. The Ego concentrates its efforts on ridding the body of the useless food. Therefore a man cannot think well after a heavy meal.