The former Destiny's Child star took on the drastic diet because she didn't think she'd be able to lose the necessary weight quickly enough--before the filming of movie musical Dreamgirls began.
She says, "I wanted to make a physical transformation because I was playing this role and I wanted to be not Beyonce... It was a big sacrifice.
"I basically ate vegetables, I had a trainer, I was very healthy. I did do a two-week fast but (I took) all the vitamins and nutrients your body needs.
"I normally wouldn't have done that for Beyonce, as a performer, but Dina, as the character, I needed to drop it really fast."
And curvy Beyonce admits she has no plans to keep all the weight off, and has already gained back half of what she lost: "I've put on 12 (pounds)."
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