It's a good question ... I think sometimes we become too fixated on the numbers on the scales, after all most other people don't know what we weigh, but see our size. When I have clients who don't know how much they weigh/lose they are always happier and tend in general to do better. Maybe because they can see their bodies shrinking and their clothes getting loser. I have quite a few (ladies it must be said!) who now don't know how much they weigh and i only tell them when they get to a certain weight or lose so many pounds/stone.