My sense is this is correct statement. I've only know a handful of real athletes in my life,...and I mean people who do two a days, constantly training and developing technique, striving for that competitive edge. My observation -- no way that could survive fasting, their performance would tank and tank fast and I suspect their health would suffer too. These people are calorie burning machines..

But, that's like 5% of the fitness crowd, maybe. I think it is a whole different story for the weekend warrior and even the avid fitness guy, especially the older athletes. On a macro level I think their performance would actually improve by getting control of blood sugars, weight, fat storage utilization via fasting. Yeah, no regional stars will be coming out of that crowd, but training and nutrition for Joe average is a whole different thing than T & N for Michael Phelps. . .