Kind of tangential to the article but regarding phosphoric acid and its use as anti-nausea, is this why bubbly white sodas are a household cure for upset stomachs? This was a go-to for my family in the US as a kid when I had a stomach flu (saltines and 7-up), and i guess it was pretty common
As a kid in the 70's growing up in Scotland we were given Lucozade (long before the "energy drink" fad) and quite often Ferguzade (a similar product but made in Scotland) when we were ill. Both had pretty odd tastes back then, almost salty if I remember.
These days, Lucozade Sport (in multiple flavours) has taken over, but being "isotonic", presumably has various salts.