Chris Pratt (Lost and Gained Multiple Times): Hollywood Weight Loss
Credit: Everett

The Parks and Recreation star has reshaped his body several times over the past three years for the big screen. Deemed "too fat" after auditioning to play first baseman and catcher Scott Hatteberg in 2011's Moneyball, he eventually lost 30 pounds and secured the part. He then says he "ballooned" to around 280 pounds to play a "fat alcoholic" for the reunion flick 10 Years. The following year, he uncovered a Navy Seal-worthy six-pack for Zero Dark Thirty, but it didn't stay visible for long: He tipped the scales at 300 pounds for 2013's Delivery Man, in which he played a harried dad. ("You can watch this movie, you can see just how big a man can get when he truly lets himself go," he's said.) In August, he'll take up less space on screen in Guardians of the Galaxy, where his six-pack is back. We wouldn't expect less for a character called Star Lord.

The Bottom Line:
If Pratt wants to be able to continue to quickly bounce back from his weight gain cycles, he needs to be careful about how long he lets himself hover at his highest weight. "If an actor was asked to put on 40 pounds and keep it on for five years, he might find it's actually difficult to take the 40 pounds off. Studies suggest the body does adapt," says Kushner. "The reason why the actors are able to do it so successfully is because it's time-limited."