Movies often come to life thanks to Hollywood stars who go to extreme lengths to fully embody their onscreen characters.

From drastic weight loss to dramatic muscle gain, when these A-listers show up looking completely unrecognizable for a role, it instantly becomes a hot topic of discussion.

Here’s a list of 20 actors who took method acting to a whole new level, and ended up paying a heavy price for their dedication.

Trigger Warning: This article discusses extreme and unhealthy eating habits that may be distressing to some readers.

Charlize Theron’s jaw-dropping transformation in Monster remains one of Hollywood’s most talked-about character makeovers. To portray real-life Aileen Wuornos in the 2003 film, Theron gained 30 pounds through a diet of Krispy Kreme doughnuts and potato chip

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