Welcome,
As others have said, try salt. There is a good thread here on how much...it is more than you think when LC, and the first phase of SB is LC.
http://forum.lowcarber.org/showthre...210#post8626210.
A boullion cube has close to 1 g of salt, and one or two cups, mid morning and afternoon, in addition to salting foods, will help with cramps.