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

toggle caption Courtesy of Nationwide Children's Hospital

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

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Spain's Alberto Contador eats a banana in as he rides in the pack during the sixth stage of the Tour de France on July 10, 2014. The cyclists aim to eat up to 350 calories an hour as they ride, and up to 9,000 calories a day. Laurent Cipriani/AP hide caption

toggle caption Laurent Cipriani/AP