She told Italian magazine Amica: "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. But I had lost too much weight."
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Megan Fox is removing her Marilyn Monroe tattoo because it has "negative energy"
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Megan - who is married to actor Brian Austin Green – now eats all the food groups but makes sure she limits the high-calorie meals she ingests.
She added: "So now I eat a bit of everything. And I train three times a week doing circuit training."
Her diet isn't the only thing Megan is changing I her life.
The 'Jonah Hex' star is also removing the Marilyn Monroe tattoo she has inked on the inside of her right arm because it has "negative energy".
The screen beauty – who has at least eight other tattoos - said: "I'm removing it. It is a negative character, as she suffered from personality disorders and was bipolar. I do not want to attract this kind of negative energy in my life."
Hollywood icon Marilyn died in August 1962 aged 36 from a suspected drugs overdose.