> Why, then, do some people become obese when they eat as their instincts tell them, and others do not? For example, I eat whenever I'm hungry, stop when I'm full (or even overfilled), snack frequently while working (mostly nuts, dried fruits, and sometimes Fritos), and yet remain thin, while others eat carefully and remain obese. What's the difference?

I really really want to see good quality food diaries for people who claim to eat little but not lose weight. I'd also want to see how much exercise they do. (And not even actual exercise, just how much they move around during the day.)