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To get into character for her role as Deena Jones in 'Dreamgirls' (pictured above) in 2006, Beyoncé Knowles did not only cut out carbohydrates from her regular diets, but almost all other foods. The Master Cleanse detox plan - a concoction of only hot water, maple syrup, cayenne pepper and lemon juice - was her secret way to quickly lose 20 pounds. She stuck to the liquid fast for two whole weeks. At the end of the movie, she told Ellen DeGeneres in 2006 that she ate a whole box of Krispy Kreme Donuts. Knowles now follows a super-strict diet that avoids all carbs and alcohol. She only eats lean-protein lunches and dinner and drinks vegetable juice for breakfast. Knowles also does an hour of cardio about five times a week.
( Photo / Dreamworks L.L.C & Paramount Pictures)