If you're trying to lose weight quickly, cut out all fruits except grapefruit.
Why on earth would you pick a diet that eliminates what American Dietetic Association spokesperson Jeannie Gazzaniga-Moloo calls "nature's perfect food"? Fruit is loaded with vitamins, minerals, and beneficial phytochemicals, she says. While fruit does contain sugar, it's helpfully packaged with fiber, which slows the absorption of sugar by the liver. "I don't think most people's [weight] problems come from eating too many apples," notes Rachel Cosgrove, cofounder of Results Fitness in Southern California and author of The Female Body Breakthrough. And while grapefruit is certainly healthful, it's no magic weight-reducer. (If the official Grapefruit Diet works, it's because it's low in calories.)