It's already questionable to me when the cookbook portion is chock full of carbs and sugar and seed oils.

Plus, they recommend against butter and cream - not because of pH - just because. You can put alcohol in that category also.

They do say that low pH / high acid exacerbates your esophagus that has been already affected by acid reflex. So from my skimming through the pages I don't know that anyone knows the cause of GERD and / or acid reflex in the first place.