I just started TiVo'ing a show on Discovery Health called "X-Weighted" about people trying to lose weight and I've found it quite interesting. The people get hooked up with this trainer/nutritionist (and sometimes a therapist, doctor, etc.) and they set goals. The show tracks them over a 3-6 month period.
I'm honestly finding it fascinating. It's so interesting to listen to the excuses & motivations of these people - and then see the hard work pay off in the end. Some of them, I've found myself saying, "They'll never keep it off because they have a bad attitude" and others I've wanted to write fan-mail to, LOL.
Anyway, it's an interesting show, nonetheless.