I am an avid racing-level cyclist. I currently use a pump and find that after 2 hours, no matter what, I always go low, unless I use zero basal. I finish races and rides with normal glycemia. I am wondering what evidence is there for or against this practice? What do you advise patients at this level of intensity to do, other than consume tons of calories (which I am sure you can appreciate is hard to do when riding)? Thanks for your time.