Black Swan (2010). Natalie Portman took on the diet and training of a real ballerina. She would eat a few grapes for breakfast, a small salad for lunch, and a few more
Mila Kunis says Natalie Portman did most of her own dance moves in Black Swan - CSMonitor.com
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Darren Aronofsky, Natalie Portman and Winona Ryder on the Making of 'Black Swan' | IndieWire