yup and if you google them...

almost all with very few exceptions put the weight right back on...

because what they are doing cannot be sustained in real life...

Yahoo just had an article on this...

...

most of em lose the weight anyhow because they did nothing but sit and eat... so even a minor change to their daily routine will cause some weight loss...

I think it was last seasons winner was just drinking energy drinks and slim fast or something for like the last three weeks of the show...