Quote Originally Posted by Nanci
Once you know that, and you know sweat and urine have about 50 meq of sodium per liter, or about 1000 mg per quart, you can replace what you are losing!
I just wanted to add that some people are saltier sweaters than others. Also, individuals who aren't acclimated to hot weather will have saltier sweat than those who are accustomed to it. If you see dried white powdery rings of salt on your clothing after a major sweatfest, this is a big clue.