Eating refined carbohydrates like bagels may stimulate brain regions involved in reward and cravings, research suggests. iStockphoto.com hide caption

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Dr. Michael Fleming, past president of the American Academy of Family Physicians, considered himself obese when this photo was taken in 2004. He led efforts by doctors to lose weight. Mario Villafuerte/Getty Images hide caption

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Going to the doctor may be uncomfortable for people who are worried about weight. iStockphoto.com hide caption

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A shopper at a branch of South African retailer Pick n Pay in Johannesburg. Health insurer Discovery offers rebates on health food at the chain to its members who enroll in a health promotion program. SIPHIWE SIBEKO/Reuters /Landov hide caption

itoggle caption SIPHIWE SIBEKO/Reuters /Landov