Inside a mobile clinic parked near a Conservation Corp high school, Dr. Seth Ammerman talks with a patient. About 400 young people who visit the van each year have never seen a doctor, Ammerman says. Farida Jhabvala Romero/KQED hide caption

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Farida Jhabvala Romero/KQED

A team of pediatricians noticed that many of their young black and Hispanic patients were deficient in vitamin D. A hefty weekly dose of of the vitamin for two months was needed to get most of the teens' blood levels to the concentration that endocrinologists advise. Noel Hendrickson/Ocean/Corbis hide caption

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Noel Hendrickson/Ocean/Corbis

Physical exercise, diet and supportive counseling are the first steps of any weight-loss program. But sometimes that's not enough to take large amounts of weight off, and keep it off, doctors say. 13/Ocean/Corbis hide caption

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13/Ocean/Corbis

Surgery Helps Some Obese Teens In Battle To Get Fit

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E-cigarettes work by heating up a fluid that contains the drug nicotine, producing a vapor that users inhale. The devices are most popular among young adults, ages 18 to 24, a federal survey indicates. iStockphoto hide caption

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Most E-Cigarette Users Are Current And Ex-Smokers, Not Newbies

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The large British study, begun in 1958, tracked the diet, habits and emotional and physical health of thousands of people from childhood through midlife. iStockphoto hide caption

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Childhood Stress May Prime Pump For Chronic Disease Later

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Maria Fabrizio for NPR

Playing Youth Sports Takes A Lot More Green Than It Used To

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People who don't get enough sleep show higher levels of inflammation, say scientists who study colds. Smoking, chronic stress and lack of exercise can make you more susceptible to the viruses, too. Frederic Cirou/PhotoAlto/Corbis hide caption

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Frederic Cirou/PhotoAlto/Corbis

Sleep More, Sneeze Less: Increased Slumber Helps Prevent Colds

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Detweiler was surprised to learn she wasn't eating enough to fuel her training regimen. As an athlete, doctors and nutritionists say, she needed more food variety and more calories — three snacks daily, as well as bigger meals. Courtesy of Nationwide Children's Hospital hide caption

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Courtesy of Nationwide Children's Hospital

To Thrive, Many Young Female Athletes Need A Lot More Food

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Ten-year-old Jake Herrera and his Los Angeles team run around the diamond as a warmup for baseball practice. Benjamin B. Morris for NPR hide caption

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Benefits Of Sports To A Child's Mind And Heart All Part Of The Game

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Dr. Donald Brown inoculated Kelly Kent with the HPV vaccine in his Chicago office in the summer of 2006 — not long after the first version of the vaccine reached the market. Charles Rex Arbogast/AP hide caption

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Charles Rex Arbogast/AP

Kids as young as 13 purchase e-cigarettes, or "vape pens," online, where independent sellers don't necessarily ask a buyer's age. Jenny Lei Bolario/Youth Radio hide caption

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Jenny Lei Bolario/Youth Radio

Candy Flavors Put E-Cigarettes On Kids' Menu

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Solid friendships can help buffer life's stress. iStockphoto hide caption

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Teens Who Feel Supported At Home And School Sleep Better

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Heavy Teens Eat Less But Weigh More Than Their Thinner Peers

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