Homeostasis. Your body works hard to maintain it. In many things, like temperature regulation and ph. You know, the stuff that will F you up in a hurry, like fry your brain (high temp) or acid cook your liver (ph too low). It’s amazing how that works.
It’s why folks can drink ACV (which has acetic acid… it’s acidic like all sour things) and not die or pickle their innards.