At least two members report improvements after POIS when increasing salt-intake:
POIS_DICK: "my POIS is way more manageable since I got my diet dialed. I eat tons of salt when I'm in a POIS state, 2 tablespoons in a cup of water and i sip that all day. This had a major effect on the intensity of the symptoms"
orlands:"I have been drinking a lot of water and salt. It has been making a huge difference in my energy levels" ..." I'm just drinking 2 gallons of water and Himalayan salt a day.
I know it seems a bit extreme. But I'm feeling much much better." ... "I'm not recommending anything. But this doctor says that water and salt lowers histamine levels. But please, don't believe me. Go study.
https://www.youtube.com/watch?v=8xweziIaUMo"
There are many theories on the effect of salt on POIS. In the long run it might increase stommach acid and be beneficial for nutrient absorption. In the short run, it might cause a raise in blood pressure and vasoconstriction (same as coffeine/asprin/cold shower) and have anti-histamine properties. Vasoconstriction might temporary stop POIS-inflammatoy hormones from entering the tissues.
Quantum:"Also, as needed throughout the day, I take water with salt added to it ( salt causes fluid retention, which makes blood pressure to raise - that's why salt must
be avoided by those who have hypertension). Salted water is cheap and very effective to raise blood pressure"
But at the same time vasoconstriction seems to be caused by POIS itself, at least the first day after POIS/NE/O (since people are experience cold fingers/feets at that time). However, after the initial vasoconstriction, maybe a vasodilution occur - because of advancing blood vessel inflammation - and that is when the more severe POIS-symptoms start to develop.
I like to hear what you think about this idea and when it is best to stimulate vasoconstriction and vasodilation during a POIS period.