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Matt Damon
Matt Damon is one of the few celebrities who had to add and lose weight at some point in his career to fit into movie roles. In 1996’s Courage Under Fire, Matt landed the role of a petite Gulf-war veteran and allegedly lost some 40 pounds. If that wasn’t impressive enough, he did the opposite and gained 30 pounds in the 2009 film The Informant, where he played the role of a fat FBI whistleblower. During the movie’s premiere, he credited a couple of fast-food joints such as McDonald’s for helping him add weight in such a short amount of time.