It's totally a set-up for poor Mr. and Ms. chubbs sitting at home... Yeah they can do something about it, Yeah they should try and make a poitive change but the way it's done on t.v. can be quite mis-leading.
The guys on telly get their own p.t's, a strict diet put on for them, encouragement from like minded big people while in there, not to mention the motivator that they are on t.v. and will most likely not want to be branded a real loser for not pulling it off.
It's hard enough for the average lardies to get going on their own, but to maintain it after a life of neglect and trashing the body can be nigh on impossible for them to maintain without the added help... Especially if their partners are still chowing down on kfc and maccas.
Personally don't watch the crap as it's the only thing that'll put me off my food :-/