Chefs Jose Andres and Alice Waters pose along side her newly installed portrait, by photographer Dave Woody, at the National Portrait Gallery in Washington, on Jan. 20, 2012. John Rose/NPR hide caption

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People stroll down a street in Montpelier, Vt., last summer. In 1995, 13.4 percent of Vermonters were considered obese. The figure climbed to 23.5 percent in 2011. The latest national data suggest the obesity epidemic has plateaued, however. Toby Talbot/AP hide caption

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Jenny Craig brand ambassador and singer Mariah Carey (left) poses with Dana Fiser, CEO of Jenny Craig, at a press conference in New York City in November. Cindy Ord/Getty Images hide caption

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Anna Hu at the Ao Hua Farmers Market in Shanghai. After years of working long hours and eating only in restaurants, Hu has learned how to cook vegetables and eat more healthfully. Eliza Barclay/NPR hide caption

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Rachel Zayas, a registered nurse, sets up the shift board for the night shift at the Cleveland Clinic. Chuck Crow/The Plain Dealer /Landov hide caption

itoggle caption Chuck Crow/The Plain Dealer /Landov

Our drive to eat more in the winter may be a product of less sunlight — or more temptation around us. iStockphoto.com hide caption

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Overweight guys will have even more company in a few years. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images