hi heather - well, I take a magnesium and zinc every day because
   I'm a big believer in them and eat cheese, which takes care of
   my electrolytes. The 2.5 lbs overnight is all just water weight
   from doing a lot of sitting in a vehicle all week, then suddenly
   expending a lot of energy in a short time. All that sitting
   built up the water-holding I suspect. "