I stumbled onto it and... haven't noticed anyone speak of it. Today read about it first time in my life.
Foods certainly have different pH levels. Could explain why sometimes some foods don't want to go down, or vice versa, even when the item either has something in it you need or not. That some "cravings/wants" and good tastes have nothing to do with nutrients in them but instead the pH level.
What I read says pH level plays a role in metabolism. That you can eat as healthy foods as you want, but if your pH is off the nutrients won't be as bioavailable. Could be a cause for some health problems that don't seem to go away, because pH is not addressed.
Another aspect of health to consider. Especially for beginners.
Between 7 and 8 is supposedly the right range of pH.
Meats are acidic, minerals are alkaline. Could explain why ZCers seem to need more minerals for optimal health. Greens are alkaline (carnivores tend to munch on greens from time to time).
It seems sort of similar with "Schumann" resonance. The first astronauts got sick in orbit not having Schumann resonance up there... they equipped all manned vessels with a Schumann resonator - fixed the problem. Speaks how important it is. Down on earth, now, there's wifi, cell phones, towers, etc., getting in the way of and overpowering the Earth's natural frequency aka Schumann resonance. (Those really do affect people... got wifi straight through my head for months... Eventually I began having this urge to get away when sitting in front of the computer. Then the headaches came. Thought it was low magnesium, extra magnesium made it a little better for several days. Then got rid of wifi and voila! The urge to get away is gone, but now have to heal from direct wifi damage... energy weapons... eh, in my home... killing me. An experiment was done with plankton once; wifi, and similar, killed them eventually.)