How the Stars Stay Slim
Credit: Jon Kopaloff/FilmMagic; Don Arnold/WireImage.com
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Ashley Tisdale and Oprah Winfrey
When it comes to meal time, these two ladies are clock watchers. The Hellcats star won't indulge in carbs after 3 p.m., while the talk show host won't eat past 7:30 p.m. "It turned out to be one of the most effective changes I made," Winfrey said.