Somewhat related - for a few weeks before i had my surgery, I watched what my female co-workers were eating when they were having lunch in the employee break room. There were a couple of them who ate what I would have called at the time a "normal" lunch. For example, and sandwich, a bag of chips, and a couple of cookies. But almost everyone else ate these tiny lunches. A thing of yogurt and an apple. Half a sandwich and a container of baby carrots. Yogurt and half a bagel. I came to the conclusion that this is basically how most normal, never-been-obese women ordinarily eat (unless they're going out for an occasional restaurant lunch, of course), and that those who ate the more substantial lunches were probably pretty active or blessed with great metabolism. It was pretty eye-opening.