Sweating depletes electrolytes. If anyone has ever experienced a mid-run cramp, side stitch or an outright bonk, you're probably experiencing the symptoms caused by a loss of sodium and potassium. In one of my last public blog posts (before going private), I wrote about an athletic study on using pickle juice to stave off cramping. As weird as it sounds, it works. The guy who I learned this from is a doctor from Michigan. His name is Rick Ganzi and I've run 12 or so marathons with him. He's featured in today's online MSNBC Health section - the article is found here. Scroll down the page for a more technical explanation of why it works.