Peg, thanks so much for the reply. That really makes sense to me. We also notice when our daughter plays sports that she seems to need more water/gatorade than the others, yet she is a non-salt waster. I think the way the endo explained it to me is that on a normal day-to-day basis she is not salt-wasting, but under stress she probably does lose more salt than the non-CAH person. My daughter also has a hard time dealing with the summer heat. That can be a real stress for her.