If you didn't believe me before that one of the benefits of owning a Wii is actually losing weight, here's proof. This guy did an experiment where by he played Wii Sports for 30 minutes a day for six weeks, did nothing else outside of his regular routine, and lost 9 pounds! And to boot, he did this over the Christmas holidays. He even admitted to eating and drinking more than normal, cause well, that's what you do over Christmas. I'm actually quite impress that he tried to as scientific as possible to prove a point.
Now as impressive as this is, the real point here is that you must exercise to maintain a healthy weight. This man was by no means fat, and I wouldn't even have called him overweight in his "before" pictures. Also, to help lose weight, you need to start on a program and keep on it. We live in an instant gratification world, but losing weight takes time and dedication.