Testosterone levels in men can go up and down throughout the day. Katherine Streeter for NPR hide caption

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Katherine Streeter for NPR

Test First Before Going For Those Testosterone Supplements

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Katherine Streeter for NPR Katherine Streeter for NPR hide caption

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Katherine Streeter for NPR

Testosterone, The Biggest Men's Health Craze Since Viagra, May Be Risky

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Consuming anywhere from about 2,600 milligrams up to almost 5,000 milligrams of sodium per day is associated with more favorable health outcomes, according to a study. iStockphoto hide caption

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iStockphoto

Nutrition researchers are reaching a new consensus: Cut back on all those refined carbs. And remember that some fat is good. Stacy Spensley/Flickr hide caption

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Stacy Spensley/Flickr

Rethinking Fat: The Case For Adding Some Into Your Diet

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If new guidelines are followed fully, half the medicine chests in America could eventually be stocked with cholesterol-lowering drugs such as atorvastatin, the generic form of Lipitor. Bill Gallery/AP hide caption

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Bill Gallery/AP

The rupture of a weakened portion of blood vessel (the dark blue spot in this brain scan of a 68-year-old woman) can prompt bleeding and death of brain tissue — a stroke. Simon Fraser/Science Source hide caption

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Simon Fraser/Science Source