A pro XC skiier told me that Cramping has more to do with over stressing your muscles then it has to do with what or how much you eat or drink. I am not sure about the science behind it but I do know that I do not get as many cramps as I used to. The worst cramping I had was during my first marathon in Portland 2001. The last 6 miles were one cramp after another. It wasn't fun trying to use the curb to stretch the cramp out of my Calf muscle and watching little old ladies pass me. I think I finished the marathon around 3:30 but was shooting for 3:10. I have not run since. Biking is for me!!