18 Extreme celebrity weight changes

In traditional method acting an actor will stay in character while on set. Some even train in the profession or act out the lifestyle of their character in the weeks leading up to a production. But these 12 dramatic body transformations, from Matthew McConaughey to Michael Fassbender, take the concept to new extremes.

1.) 50 Cent dropped 54lbs for 2011’s All Things Fall Apart

50 Cent dropped 54lbs for All Things Fall Apart in 2011

2.) Christian Bale lost 4 stone for his role in The Machinist in 2004

Christian Bale lost 4 stone his role in The Machinist in 2004

3.) Matthew McConaughey shed almost 4 stone for Dallas Buyers Club in 2013

Matthew McConaughey shed almost 4 stone for Dallas Buyers Club in 2013

4.) And Jared Letto lost over 40 lbs from an already light frame for the same movie

And Jared Letto lost over 40 lbs from an already light frame for the same movie

5.) Natalie Portman somehow dropped 20lbs for 2010’s Black Swan

Natalie Portman lost 20lbs for 2010's Black Swan

6.) While Mila Kunis lost 15lbs for her role in the movie

While Mila Kunis lost 15lbs for her role in the movie

7.) Jennifer Hudson lost 80 pounds and became a spokeswoman for Weight Watchers in 2010

Jennifer Hudson lost 80 pounds and became a spokeswoman for Weight Watchers in 2010

8.) Jonah Hill lost 30 pounds in 2012 in preparation 21 Jump Street

Jonah Hill lost 30 pounds to prepare for his role in 21 Jump Street

9.) Matthew Fox trained for 5 months for the lead part in 2012’s Alex Cross

Matthew Fox trained for 5 months for the lead part in 2012's Alex Cross

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