4 Crash Diets -- Tested

The Raw Food Cleanse

The Diet: The Raw Food Cleanse is a three-, seven-, 14-, or 28-day plan that claims to reset your digestive tract. It's based on the theory that cooking depletes foods of nutrients, so you should eat fruits and vegetables in their raw state. There are recipes for fruit and vegetable juices, soups, and salads. Daily intake is around 1,200 to 1,400 calories, estimates Andrea Giancoli, RD, a spokesperson for the American Dietetic Association.

The Tester: The Social Butterfly, Sarah Davis, 34

Sarah, who wants to drop 15 pounds, knows her restaurant habit is out of control: "My friends and I go out all the time," she says. When she's home, she rarely preps healthy meals.