Dr. Jame Abraham used positron emission tomography, or PET, scans to understand differences in brain metabolism before and after chemotherapy. Dr. Jame Abraham hide caption

itoggle caption Dr. Jame Abraham

According to a study published in Pediatrics, boys are entering puberty six months to two years earlier than they did in past studies. iStockphoto.com hide caption

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Fraud victims are more likely to have opened official-looking sweepstakes notices and other mailings. A new study says the elderly are more susceptible than the young to being swindled. Allen Breed/AP hide caption

itoggle caption Allen Breed/AP

In the U.K.-based program called Txt2stop, researchers sent smokers encouraging text messages, like the one above, to help them quit. Karen Castillo Farfán/NPR hide caption

itoggle caption Karen Castillo Farfán/NPR

Employees at at Salo, a Minneapolis-based financial consulting firm, walk while working on treadmill desks. The firm offers treadmill desks for employee use and encourages an active workplace environment. Salo LLC hide caption

itoggle caption Salo LLC

Lyme disease is spread by deer ticks like this one. A study finds that some people can be reinfected many times with the bacteria that cause the disease. Lauree Feldman/Getty Creative Images hide caption

itoggle caption Lauree Feldman/Getty Creative Images

More elderly drivers will hit the road in the next decade, but family members wonder: When is it time for elderly loved ones to move to the passenger seat? Martin Novak/iStockphoto.com hide caption

itoggle caption Martin Novak/iStockphoto.com

Doctors may recommend that obese patients use weight-loss drugs to trick their hunger pangs. iStockphoto.com hide caption

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Eating low-glycemic foods, or foods that take longer to digest, may help you feel fuller for a longer period of time. Robyn Mackenzie/iStockphoto.com hide caption

itoggle caption Robyn Mackenzie/iStockphoto.com

Mammograms may pose a particular risk to women with genetic mutations that predispose them to breast cancer. Bill Branson/National Cancer Institute hide caption

itoggle caption Bill Branson/National Cancer Institute

Federal health officials recommend 1,000 milligrams of calcium per day for people younger than 50, but some are overdoing it. iStockphoto.com hide caption

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When it comes to learning how to drive, your teen is probably as harried as you are. Research shows that scare tactics meant to instill caution, though, are less effective than kind words. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Young activists distribute condoms at an AIDS awareness event in Ashbury Park, N.J. Charles Sykes/AP hide caption

itoggle caption Charles Sykes/AP