We are all Russian nesting dolls: Our intestines house many bacteria, which house many viruses. These so-called bacteriophages are likely as important for our health as the bacteria they live in. Lisa Brown for NPR hide caption

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Helping employees take the time to go for a walk instead of reaching for junk food when energy flags boosts productivity, some firms find. Jamie Grill Photography/Tetra Images/Corbis hide caption

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Targeting Overweight Workers With Wellness Programs Can Backfire
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The 1990s were rife with low-fat packaged snacks, from potato chips to cookies. Youtube and RetroJunk hide caption

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Why We Got Fatter During The Fat-Free Food Boom
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Euclid Market, a corner store in East Los Angeles, recently got a makeover to promote healthier eating. It not only sells more fruits and vegetables, but also offers cooking classes and nutrition education. Courtesy of Margaret Molloy/UCLA Fielding School of Public Health hide caption

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It Takes More Than A Produce Aisle To Refresh A Food Desert
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Researchers say that setting your thermostat a little lower can help you burn more calories. iStockphoto hide caption

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