Mary VanDam pours coffee for patron Jim Brumm at Mr. B's Pancake House in Laketon Township, Mich. Cory Morse/Muskegon Chronicle via AP hide caption

itoggle caption Cory Morse/Muskegon Chronicle via AP

Scientists thought that people with stronger taste sensations would have needed less salt. TooFarNorth/Flickr hide caption

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Youth teams play on an auxiliary outdoor rink before the 2010 New Year's Day Winter Classic NHL hockey game. New research shows that young players in leagues that allow checking are much more likely to suffer concussions and serious injuries than kids who play in leagues that ban it. Elise Amendola/AP hide caption

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New studies show that getting enough sleep can improve performance in academics and athletics. hide caption

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Researchers found that moms were more likely to stop buying junk food when it cost more. Paul Vernon/AP hide caption

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Not only are kids snacking more frequently, but they're eating more unhealthful foods, too. hide caption

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Scientists are working to understand what hormonal and physiological cues in the body lead the brain to respond to food emotionally. hide caption

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Bob Karch is the chairman and a professor in the Department of Health and Fitness at American University. Here, he helps cross-country champion Steve Hallinan check his heart rate while cross-training on the bike. Allison Aubrey/NPR hide caption

itoggle caption Allison Aubrey/NPR