If you're at high risk of hepatitis B infection, your insurance company should pay for testing for the virus without passing any of the cost on to you. London School of Hygiene and Tropical Medicine/Science Source hide caption

itoggle caption London School of Hygiene and Tropical Medicine/Science Source

Truvada can dramatically reduce the risk of HIV infection when taken as a preventative medicine — if taken every day. Studies are underway to determine if young people are likely to take the pill consistently. Justin Sullivan/Getty Images hide caption

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Hanna Barczyk for NPR

To keep kidney stones at bay, drink plenty of cool, clear water. iStockphoto hide caption

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Illustration by Katherine Streeter for NPR

We'd all like a medical genius like TV's Dr. Gregory House to rescue us from a life-threatening crisis. But what can he do to prevent diabetes? Adam Taylor/Fox/AP hide caption

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A bartender pours a beer at the Nomad Pub in Milwaukee, Wisc., in 2006. Darren Hauck/Getty Images hide caption

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Dr. Tom Nary is the director of health services at Boston College. Tovia Smith/NPR hide caption

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STD cupcakes: From Two Little Cats Bakery in Cambridge & Hertfordshire, these chocolate cupcakes feature symptoms of sexually transmitted diseases, including gonorrhea, syphilis, genital warts, chlamydia and HIV. Eat Your Heart Out 2012 hide caption

itoggle caption Eat Your Heart Out 2012