Your experience is interesting to me. I'm a runner as well and I end up doing several races per year including a marathon, a few 1/2s, few 5k and 10ks. Do you do any interval training or long runs on the days you fast? What do you do about post run nutrition replacement and do you do glucose replacement during your longer runs? I'd love to shave off a few pounds for racing reasons as well. I always find myself eating more as I up my milage anyway so my weight usually stays constant.