Some years ago, I heard a programme on the radio about someone with ME/CFS who improved from an alkalizing diet (took about a year though).
I tried alkalizing, but I found alkalizing always made me feel lightheaded and mentally, made me feel sort of flimsy and lightweight, so I always discontinued after a few days. (This lightheadedness/lightweightness was the same whether I alkalized via diet or bicarbonate).
As I was theorizing about possible mechanisms, I thought initially that an alkalizing diet might work by increasing blood CO2, which in turn would increase tissue oxygenation.
This thought occurred to me because we know the body tries to keep blood pH relatively constant, and CO2 is one of the factors that affects blood pH (because CO2 when dissolved in water become carbonic acid, so CO2 act to acidify the blood).
So I presumed that as you start consuming bicarbonate, which acts to alkalize, the body will raise CO2 levels in the blood to compensate, in order to prevent the blood from becoming too alkaline.
However, as far as I could determine, it turns out that this is not the case:
if you see
this article, it says:
When CO2 builds up, a central receptor increases ventilation even if pH receptor is sensing high pH.
In other words, according to that article, normalizing blood CO2 levels seems to have priority over normalizing blood pH, and the body will expel excessive CO2 (through increased breathing), even if doing so leads to further blood alkalization.