A massive research project in California is beginning to show how genes, health habits and the environment can interact to cause diseases. The new combination of genetic and health information is one of the most powerful research tools on earth, a researcher says.
Girls say they are using steroids, too, although they're using the illegal drugs less often than boys, according to researchers at the University of Minnesota and Columbia University. And the researchers found that many teens using steroids or muscle-enhancing supplements are overweight or obese.
Endurance athletes often turn to the same stimulant that gives your morning cup of joe its jolt: caffeine. They're increasingly using caffeinated gels and drinks when they compete. But how much is too much?
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