#3: Christian Bale Lost Dangerous Amounts of Weight for The Machinist (2004)
Christian Bale pushed his body to the limit while preparing for The Machinist (2004). Living on an extremely restricted diet, he lost around 60 pounds to portray an insomniac factory worker. Only months later, he rapidly regained muscle for Batman Begins (2005), raising concerns about the health risks of dramatic weight changes.

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