Mila Kunis barely ate when she was making Black Swan

Mila Kunis barely ate when she was making Black Swan.

The 42-year-old actress candidly admitted she had a gruelling diet and exercise regime when working to portray a professional ballerina in the 2010 movie, which was directed by Darren Aronofsky and also starred Natalie Portman.

Mila told Vogue magazine: "My prep was a lot of dancing and very little eating — which I know you’re not supposed to say, but it’s the truth. I drank a lot of broth and danced for 12 hours a day.

"We were only supposed to have three months of prep before filming started, but we lost some financing, so that got extended to six months while Darren tried to find money.

"It sucked for Darren, but Nat and I were so happy because we had three extra months to dance."

And the intense shoot also saw Mila sustain a number of injuries, including one which left her afraid she would have to leave the production.

She said: "We would shoot those dancing scenes for hours, and I had bruises all over my ribs just from being lifted over and over again.

"I also dislocated my shoulder pretty early in the production and thought I was completely screwed, but Darren sent me to an acupuncturist and I somehow came out totally fine."