Yahoo had an article about some of the past contestants with before, after and now pics. Most are still looking good. The one that is starting to look huge again is the winner of a few seasons ago..Matt, he's the one that married the blond girl that was also on the show. I hope he gets back on track.
I did a pilates demo at a health expo for a hospital in my area and they were special guests. Needless to say when I saw them I thought "THEY were on the Biggest Loser?" Kind of an "asshole-y" thing to say but that's what I thought. they were BIG.
One of the problems I have with this show, while I love it, is that they base it more on physical weight than health. I remember one episode in particular where the people who lost (not the winners, they lost on the show, um...didn't win the prize) looked really, really good. They were actually doing weight training, so the guy was buffed out and the girl was toned. Thing is they gained muscle which was counted in for "weight."
The other couple, however, were just skinny fucks with tons of skin hanging off them...and guant looking---like jsttennis77 stated. They won the prize even though they were clearly less HEALTHY than the other couple.