Why did Robert De Niro gain weight for his role in Raging Bull?

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Martin Scorsese smiling in a tuxedo and bow tie, holding an Oscar statuette at the Academy Awards, with a gold Oscar statue in the background. — Martin Scorsese American film director Martin Scorsese, 2008.

Robert De Niro gained more than 50 pounds (about 23 kg) for his role in the 1980 film Raging Bull to accurately portray the boxer Jake LaMotta during the later stages of his life.1

De Niro is widely recognized for his intense preparation for roles, and this physical transformation was part of his commitment to masterfully depicting the character. His performance in the film, directed by Martin Scorsese, earned him the Academy Award for Best Actor.1