Opal I just checked out some of the before and after pics on the site you linked to.
They are truly inspirational. What struck me the most was not the change in size, but the change in demeanor. In the before shots most of the people looked really tired and really sad. In the after shots the change was amazing - big smiles, glowing complexions - it was wonderful to see.
I wish you tonnes of luck - hopefully you will have as much success as the posters on that page.