4,000 calorie diet to...what? I would be willing to be a diet change is more like 90% of the difference here, along with some moderate changes in workout. Someone who weighs 800lbs will lose a ton of weight just in diet chane alone, WITHOUT exercise. The problem is, 95% of the population will read the headline "Wii helps woman lose 112lbs" (Yahoo) and they will believe it. I need to start preying on the intellectually inferior...apparently its working very well...