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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JONAH HILL
From Superbad to super-slim! Hill revealed his 30-pound weight loss before production began on 21 Jump Street back in 2011. “He got a nutritionist and a trainer,” a pal told Us Weekly.