I cannot usually relate to any of these studies, because of this...my eating has nothing to do with hunger, but things like everyone else is eating, the food looks/smells good, it's mealtime. If I only ate when I experienced true hunger I would never have become obese in the first place. It's only since I started practicing IF that I learned what hunger feels like rather than just appetite. And many of the obese people I know would say the same thing if they were being honest.