Paul Mason, once called the world's fattest man, has lost more than two thirds of his weight and now wants surgery to remove his excess skin.The 51-year-old former postman from Ipswich, England weighed 980 pounds. After having gastric bypass surgery three years ago, he has slimmed down to a comparatively svelte 350 pounds. The dramatic weight loss has left Mason with huge folds of excess skin around his stomach, arms and legs. According to the British newspaper The Sun, Mason must use a wheelchair because the excess skin hampers his ability to walk. "It doesn't matter how much toning up you do, it's only going to get worse," The Sun quotes Mason as saying.