Professional athletes are using low carb diets (http://www.latimes.com/food/la-fo-calcook-side-20130622-story.html http://www.latimes.com/food/la-fo-calcook-sid

Professional athletes are using low carb diets (http://www.latimes.com/food/la-fo-calcook-side-20130622-story.html http://www.latimes.com/food/la-fo-calcook-side-20130622-stor...) And there is no real conclusions for long runners either (http://bjsm.bmj.com/content/early/2014/05/26/bjsports-2014-093824.extract http://bjsm.bmj.com/content/early/2014/05/26/bjsports-2014-0...)