Colorado Runner - Colorado's running news, events and results source

The American College of Sports is a professional organization for sport science researchers, educators, exercise physiologists, sports dietitians and doctors. At ACSM's Annual Meeting more than 4,500 members from around the globe presented their latest research.

Trail running has become one of the fastest-growing outdoor sports, combining physical endurance with an exhilarating connection to nature. Unlike road running, trail running offers the challenge of uneven terrain, steep ascents, and ever-changing landscapes.

Most runners want to perform at their best. They train hard and fuel up/refuel in a manner that supports their desired physique. Despite their best efforts, they sometimes end up disappointed. They then start to train harder and restrict food to get even leaner. And that's where the problems often…