Today, you likely rubbed your eyes, scratched your nose, wiped away a crumb from your mouth, or smoothed over your temples—or something in between. In fact, today, you likely touched your face dozens, if not hundreds of times, without even realizing it. And ...

What is it about food? Serve us a plate with normal-sized portions and no other food on the table, and we'll eat it and likely be quite satisfied. But put us before an all you can eat buffet, and suddenly our hunger sensor goes on the blink and we eat until we ha...