Most Shocking Celebrity Weight Loss

Whether they’re slimming down to play a perfectionist ballerina or bulking up to a gladiator-esque stature, celebrities often need to change their shape drastically—and on short notice—to ace roles (or meet the expectations of a critical public). he problem? This type of dieting can be bad for your health.
Crash diets can weaken your immune system, leaving you more vulnerable to getting sick and may even hurt your heart.

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ZACH GALIFIANAKIS
The Hangover star’s dramatic weight-loss first made headlines in October when the once-portly comedian showed up to the screening of Birdman, on the closing night of the New York Film Festival, having gone down a few clothing sizes. It’s estimated that Galifianakis may have lost as much as 50 pounds.