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

A pizza from a Pizzomatic vending machine that bakes and sells pizzas in Germany. Public health advocates say the food industry needs to make concrete commitments to making healthier products to reduce chronic disease related to diet. OLIVER BERG/AFP/Getty Images hide caption

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If you're overweight, the best way to spend your limited time exercising is aerobic activity, a researcher says. Rhodes ludovic/iStockphoto.com hide caption

itoggle caption Rhodes ludovic/iStockphoto.com