When we started eating low carb, I mean really, really, low carb, I started getting horrible leg cramps; the kind that wake you with a startle, in the middle of the night. I had always had foot cramps if I stretched my foot a certain way. Anyway that is a known issue eating low carb, although not a real common one. I started taking magnesium and they cleared up, for the most part. Make sure you can take it.
I swam competitively most of my teen into adult years, and lived in pools, creeks, lakes, ponds, and rivers, all summer, from the time I could walk. I never understood how someone could drown from cramps. Well ............... these were so bad I realized how someone could drown from cramps.
gg=alice
). Been doing this for years. The only sugar in the house is for the humming bird food but I do sneak in candy sometimes; chocholate especially.
Other variables have changed too, like the vitamins, but the water seems to make the most sense. 
Difficult place to stretch out a cramp! I usually just have to get out of bed and walk it out. My grandmother is the only other person I've ever heard of who has cramps/"charlie horses" in that area of the leg. 