Older women on a diet don't need to stop eating out; they just may need to make wiser food choices to keep weight off. iStockphoto.com hide caption

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It may not be the best strategy to stay up late and cram. A new study finds that when teens don't get the sleep they need, all kinds of things can go poorly. iStockphoto.com hide caption

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Samantha Kerr prepares coffee at Artifact Coffee in Baltimore, MD. Maggie Starbard/NPR hide caption

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A waitress delivers a coffee and beer in Medellin, Colombia, in this 2010 file photo. Both drinks can trigger acid reflux. Raul Arboleda/AFP/Getty Images hide caption

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Bacteroides species are some of the most common bacteria in the human gut. Enviornmental Health Perspectives hide caption

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