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

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People who ate a diet high in omega-3 fatty acids and vitamin D, which are commonly found in fish, and in vitamins C, E and B, which are often found in vegetables, were less likely to have their brains shrink, and were more likely to score higher on the memory and thinking tests, a study found. iStockphoto.com hide caption

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Eric Goosby, United States Global AIDS coordinator, says field testing is necessary and urgent to determine if HIV testing-and-treating services are feasible. Brendan Hoffman/Getty Images hide caption

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Former Speaker of the House Newt Gingrich and former Massachusetts Gov. Mitt Romney chat after finishing a GOP debate in Sioux City, Iowa, earlier this month. Scott Olson/Getty Images hide caption

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