Saw a video about two women, one overweight and one skinny. They ate together regularly and the skinny woman would always eat much more food. They followed both around and while it was true that the skinny woman ate more at meals, that was also pretty much the only time she ate anything. The overweight woman was snacking all day long.

When I was working on losing weight, I very loosely did the calorie counting thing and realized that the milk and cookies I would occasionally make after dinner was like 700 calories. Before I would just think about my meals with almost no thought about the extras.