One thing to remember is that near the end of the show some of these people are carrying around 5 to 10 lbs. of "excess" skin, which they can't get removed until after the finale. There's a reason they don't take their shirts off at the finale! But what that means is to get down to say, 160 lbs. a contestant will "look" more like someone who weighs 5 or 10 lbs. less than that, sometimes fairly gaunt.