4) Joaquin Phoenix

To embody the disturbed Arthur Fleck in Joker, Joaquin Phoenix went on a diet and managed to lose more than 50 pounds in just a few months, which adds a hauntingly skeletal look to his character. Phoenix worked with a nutritionist and followed a diet with minimal calorie intake, though he later said that the cost was physically steep. His role made him bag an Oscar, and his extreme weight loss breathed life into Fleck's physical and mental condition.
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Edited by Abhimanyu Sharma