Getting enough salt eliminates my migraines. I wondered why, on keto, I was getting so many auras, when I came across a discussion of the keto “flu” in which headaches were mentioned as a symptom. Sure enough, when I remember to keep my salt intake up, no headaches!
I also find that if I am getting enough salt, my potassium, magnesium, and calcium stay within balance.
Andrew Mente of McMaster University quotes his own PURE study data and several other studies to show that we are at our healthiest when we are getting 4-6 grams of sodium (or 12-15 g of table salt) daily.