Athletes have that problem when...
...they're in heavy training and sweat a lot, and therefore drink a lot. They sweat out salts, not just water, it seems.
So they take salt pills to make up for it. So did the ancient (=19th & 20th century) explorers, and WWII troops in Africa.
Christian R. Conrad
Of course, who am I to point fingers? I'm in the "Information Technology" business, prima facia evidence that there's bats in the bell tower. -- [link|http://z.iwethey.org/forums/render/content/show?contentid=27764|Andrew Grygus]