Yea I also find it troubling that they workout so many hours a day and lose like 30 lbs in a week. It seems very jarring for the body.
Also, don't alot of the people gain some of the weight back over these shows? I guess if they didn't learn how to take care of theirself and eat properly then they lose it all? I suppose that it is very dangerous to have all this stuff handed to you like trainers and foods and then have it taken away cold turkey.