If you run, you’re at risk of dehydration; here’s what it is, how it can hurt you, and how you can prevent it

By Lindsay Park, RD, CD, CNSC
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About this time every year, people throughout the U.S. contract marathon fever. It affects people old and young and even shuts down city centers for hours at a time. In some cases, a runner picks it up by simply coming into contact with the coveted finisher’s medal.