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Let's face it: Our love for all things sweet and salty has caught up with us; health experts agree that most adults are consuming too much of both. But before you resign yourself to a lifetime of bland fare, consider tart foods, which are becoming a popular flavor alternative and have real health benefits. "As people move away from sugar and salt, sour and tart options can be high-impact, low-calorie, low-fat replacements," says Cynthia Sass, a registered dietician in New York City and author of Slim Down Now. The health perks of these three foods will win you over.