My wife has become quite involved with a game on Facebook, called Farm Town. This game apparently simulates running a farm--choosing the virtual crops that will grow there, planting, and harvesting said crops. And you have to time the growing season so your crops won't wither before you get back online to take care of them.
There is great promise in this game and the ramifications thereof. Let's say that I eat virtual foods. With such foods, there must be the possibilty of a virtual diet. So, I can eat these virtual foods and even undertake virtual exercise. If real food does not enter my body, then, in virtually no time, would't I be able to lose all manner of weight?