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

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The government needs to make the most nutritious fruits and vegetables more affordable, researchers say. iStockphoto.com hide caption

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The darker the color, the larger the proportion of the population that is obese. In the darkest brown counties, more than 30 percent of people are obese, according to 2008 data. CDC hide caption

itoggle caption CDC