My mother had an episode of hyponatremia (low sodium) during a hospitalization for something else. She was put on water restriction, which she could barely tolerate because she loved to guzzle copious amounts of water. A nephrologist was called in and prescribed an IV of something that looked like egg whites. I believe it was albumin. (This was about 20 years ago). We were also told that we could encourage her to eat salty foods. I tried potato chips (that is my nemesis), but she went for salted pistachios in the shells. She got busy cracking and the hyponatremia was righted.