Matt Damon had perhaps put on an additional 30 pounds after the filming of The Informant and Invictus, where’s all his tailor made suits appeared shrunk on a new heavier self.
Nothing convinced Matt Damon to step on a scale (to see how much weight he had gained) and hit the gym until his stepdaughter teased him with the Matty Fatty nickname.
http://www.contactmusic.com/news.nsf/story/damon-slimmed-down-after-matty-fatty-comment_1125476
Whatever it may be, find your motivation to lose weight! Matt Damon lost all that weight after gaining a large amount of weight for his role in the Informant.