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The Transformers star was shocked after seeing pictures of herself looking dangerously thin, and decided to adopt a more healthy lifestyle.
"For a year and a half, until about four months ago, I followed a strict vegan diet based on raw fruits and vegetables, no bread, sugar and coffee," Fox told Amica magazine.
"But I had lost too much weight. So now I eat a bit of everything, and I train three times a week."
A representative for Fox recently confirmed the actress had a brief fling with her Transformers co-star Shia LaBeouf during filming back in 2009.
The actress is currently shooting a supporting role in Judd Apatow's untitled Knocked Up spinoff, and has been praised for her on-screen humour by co-star Leslie Mann.
Watch Megan Fox in the trailer for Transformers: Revenge of the Fallen below:
