[randomstudent]

The K:Na balance is very interesting, especially because pre-agriculture societies usually have very low levels of hypertension, and this is probably the cause. Na+ and K+ balance does have something to do with acid-base regulation, because of urinary excretion of HCO3- and H+, but the benefits of a low sodium diet seem to be related to hypertension and not to acid-base regulation.

I haven't read the study, and I don't want to claim that Alkaline diets have zero supporting evidence. I just wanted to argue against the claim that your pH is "too acidic" or "too alkaline" or whatever. Any potential benefits of an alkaline diet are surely independent of the pH variation they induce, because the variation will be close to 0 in any case, if your body's working properly. The stress hypothesis is interesting (I'm not saying it's even remotely correct! only that it's an interesting twist on the crackpot claims I've heard elsewhere), but you'll never be able to gauge how stressed your regulation mechanisms are just by measuring the blood's pH. You'll have to find some upstream biomarker that measures "stress" directly.