14) Robert De Niro – Raging Bull (1980)

In the movie Raging Bull, to play the character of boxer Jake LaMotta, Robert De Niro gained too much weight, eating junk food and high-calorie diets. He gained about 60 pounds in a few months. This was achieved through pizzas, pasta, and other high-fat, unhealthy foods. While De Niro's transformation helped him play the post-career, out-of-shape LaMotta, his body suffered from the excess weight. Later, De Niro went through an exercise routine to lose all his weight and get back to his shape.
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Edited by Sangeeta Mathew