Actors and actresses who went to insane lengths to transform themselves.

16. Matt Damon put on 30 pounds for his role in “The Informant”rnrnDamon packed on the pounds for his role as the vice-president turned CIA informant Mark Whitacre, and had fun doing it. “I definitely got doughy. I started eating like crazy and drinking dark beer. Between meals on set, I’d eat a No. 1 Value Meal at McDonald’s and then Doritos on top of it. It was absolute heaven.”