118. "As a marathon runner, I don't need sugar for energy": Greg

Greg's been a marathon runner for years.He'd always believed that you need to "carb load" before and during a long-distance run.So he would use gels and other quick-burning sugars to get an energy boost. But then he'd suffer from the energy crash that came with them, as well as cramping.What Greg found after several experiments was that he runs better and longer with other sources of fuel: protein and fat. And also, it's not just what runners eat on the day, but also in between races or marat...