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

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.