We posed that question to eight of our favorite celebrities, and their answers didn't disappoint. (Ace bandages?)
Not that any of these should be tried at homebut you knew that!
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"I've always done crazy crash diets. I've ruined my metabolism that way. I did the hCG diet[you're injected with] a hormone that's extracted from the urine of pregnant women!"
Laura Prepon, actress in the film The Kitchen
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"I went on that lemonade-cayenne thing for about 24 hours. By the middle of the next day, I was like, 'If I don't have coffee, someone's gonna die!'"
Christina Applegate, star of the NBC show Up All Night
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Holly Robinson Peete
"A mushroom diet where I had to eat different typesporcini, shiitake... I lasted a day or two and that was it!"
Holly Robinson Peete, actress on the CBS showMike & Molly
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Kristin Bauer van Straten
"Years ago, my nutritionist was trying out this thing where we were wrapped in Ace bandages soaked in some sort of detox-to-make-you-thinner thing, and then put in ponchos. But we had to keep moving, so we walked in a circle while this boom box was playing. I've never laughed so hard in my life!"
Kristin Bauer van Straten, co-star of the HBO series True Blood
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"I did a three-day cleanse, but lasted for only a day and a half! You have to drink a lot of almond milk, [puréed] kale, and other weird stuff, which was not tasty!"
Selita Ebanks, supermodel
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"There was the diet where I ate just carrots, tomatoes, and seafood. It turned my palms yellow because of the vitamin A! People looked at me like, 'Are you sick? Do you have hepatitis?!'"
Petra Nemcova, supermodel
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"When you're on a diet and you can't have carbs, what you crave is the texture of bread or the crispiness of a potato chip. What really helps with that is pickles. It stopped me from eating more!"
Kelly Osbourne, co-host of the E! series Fashion Police
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"I tried a juice diet and quit after half a day. I was so cranky!"