I've seen bits of it a couple of times, and yes for the amount of exercise and healthy eating they do, a 2 lb loss must be very disappointing. Knowing how hard it is to loose weight, I take my hat off to them because I think to endure such a routene they are absolutely desperate to change their lives for the better, it's taken real commitment, and good on them!
Personally for what I eat and the amount I exercise a 2 lb loss is great and more importantly sustainable. Avarage jo with a job, partners, children etc wouldn't have the time to commit to such a training regime unless doing something like the biggest looser, I do hope after the show they receive after care as it would be such a shame if all their hard work went to waste x