I find this a curious hypothesis, to say the least. So I'm a marathon runner (ran a 3:08 marathon this morning, actually, at age 55). The carbs I eat are neith

I find this a curious hypothesis, to say the least. So I'm a marathon runner (ran a 3:08 marathon this morning, actually, at age 55). The carbs I eat are neither excessive, nor low fibre. And all the endurance athletes I know are extremely aware of their diets and the importance of eating the right mix of high quality foods.