Obese people -- those with a BMI of 30 to 34.9 -- have a 44 percent higher risk of death from any cause compared with those in the most-favorable range, according to a study in the New England Journal of Medicine. iStockphoto.com hide caption

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Billy Tauzin, former congressman and CEO of the Pharmaceutical Research and Manufacturers of America, in a 2008 file photo. Mike Wintroath/AP hide caption

itoggle caption Mike Wintroath/AP

Our brains have chemical pathways that make us feel good when we eat, and really good when we eat sweet or fatty foods with high calories. Scientists see these same chemical pathways used in cases of drug addiction. Paul Ellis/AFP/Getty Images hide caption

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Experts say it's nearly impossible to address U.S. fiscal problems without coming to terms with Medicare. The program provides coverage to 47 million Americans, consumes 12 percent of the federal budget and accounts for $1 of every $5 spent on health care each year. Its future includes 78 million baby boomers. Kirby Hamilton/iStockphoto.com hide caption

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A man sunbathes in Malmo, Sweden, in July. Humans (and other animals) make vitamin D when exposed to sunlight. Johan Nilsson/AFP via Getty Images hide caption

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