10 of the Craziest Celebrity Weight Gains and Losses

The stars of Hollywood never cease to surprise with their drama, whether it be on screen or off — especially when it comes to their weight. On-camera extreme weight gains and losses are incredibly shocking, but also make you realize just how dedicated these actors are to their craft. We've seen an array of stars either bulk up or slim way down for a variety of roles, and now we can add Chris Hemsworth to the list. He went from being ripped to wiry for his role in "The Heart of the Sea." The 32-year-old plays crew member Owen Chase who has been lost at sea for three months. The actor posted a picture on Instagram of his crazy change in appearance, saying , "Just tried a new diet/training program called "Lost At Sea". Wouldn't recommend it.."
Celebrity body transformations that will blow your mind.
To look this thin, Chris took on the "starvation diet" in 2013, consuming only 500-600 calories a day. Here's a look back at some other crazy transformations as well.

50 Cent

Celebrity body transformations that will blow your mind.
50 Cent went from a buff rapper to a committed actor who opted to slim down by 56 pounds to play a cancer-stricken football player in "Things Fall Apart." He was on a liquid-only diet and his exercise consisted of daily three-hour treadmill walks.

Christian Bale

Celebrity body transformations that will blow your mind.
Christian Bale lost more than 60 pounds to appear this gaunt for his role in "The Machinist." He had to bulk up soon after, however, to play Batman.

Matthew McConaughey

Celebrity body transformations that will blow your mind.
To play an AIDS sufferer in "Dallas Buyers Club," Matthew McConaughey shed 42 pounds. He did this by eating little-to-no food. “It was tough going, I’m not going to lie,” he admitted. “The dieting was pretty hardcore. I was losing 7lb every week.”

Natalie Portman

Celebrity body transformations that will blow your mind.
Natalie Portman lost 20 pounds for her role in "Black Swan." The actress, who is already very thin in real life, shocked people with her even more petite frame.

Jonah Hill

Jonah Hill
To shoot "21 Jump Street,"  Jonah Hill had to slim down, as he played an undercover police officer alongside already very fit Channing Tatum.

Gerard Butler

Celebrity body transformations that will blow your mind.
To bulk up for his role in "300," Gerard Butler had to do some serious gym training designed by personal trainers.

Tom Hanks

Celebrity body transformations that will blow your mind.
To look like he had been stuck on an island for a very long time in "Castaway," Tom Hanks had to slim way down.

Charlize Theron

Celebrity body transformations that will blow your mind.
Typically seen as sultry and sexy, this bombshell of an actress had to gain a good amount of weight for her role in "Monster."

Will Smith

Celebrity body transformations that will blow your mind.
This actor had to hit the gym five times a week and do fitness workouts on his days off in order to look like boxing legend Mohammad Ali. What celebrity's transformation is the most shocking to you?
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