We are out camping, and we've been giving the boys with CF salt pills every morning since they are sweating so much. I normally get very exhausted with hiking around, even though I am in pretty good shape for my age. So I decided to take a salt pill every morning, and I have really seen a difference. I wonder if even CF carriers lose more electrolytes than normal folks in hot weather, and wonder if this is the reason I always get so tuckered out in hot weather. Maybe it is the placebo effect at work, but I am not tired by the end of the day . . .