Some stars go to great lengths to get into character. Matthew McConaughey, Anne Hathaway, Renee Zellweger, and Christian Bale are just a few of the many celebrities who've lost or gained significant amounts of weight for movies
Chris Pratt in Guardians of the Galaxy
The Parks and Recreation star famously showed off his slimmed-down, bulked up physique on Twitter while preparing to film 2014's Guardians of the Galaxy. "I haven't always been fat, but I've been fat for the last eight years or something," he said afterward. "I love eating food and drinking beer and having fun with my life. I was also kind of depressed a little bit when I was fat and there's probably people out there who can agree and understand what that feels like."