16 Celebrities Who Went on the Most Extreme Diets for a Role

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Christian Bale

Paramount Classics

Movie: The Machinist
Christian Bale is the king of fluctuating his weight for a role. For The Machinist, Christian played Trevor Reznik, a machinist with severe insomnia. Because Trevor can't sleep in the film, this led to severe weight loss and Trevor Reznik becomes extremely thin. Christian dropped from 173 pounds to 110 pounds for filming. To manipulate this extreme 63-pound weight loss, for four months, he ate a can of tuna fish and/or an apple a day. That was it. Definitely not a diet that any nutritionist would ever recommend! On the other side of it, Christian Bale then went on to beef up in weight to portray Batman/Bruce Wayne in 2005's Batman Begins.