I wonder how qualified he is when he writes that apples are good for you because they contain no Sodium. I suspect with a B.Sc in Life Sciences from 40 years ago I actually am more qualified than him. It seems Chiropractors have branched out into endocrinology without the foundation of a medical degree. - a complex subject where you have to study the whole organism as a Doctor does because it is all interlinked. Dr of Chiropody is a made up chiropractor qualification. In the UK they have somehow got people to believe that they are a branch of medicine.
I actually have one of his books - he describes various body types and their collection symptoms - liver type, adrenal type, thyroid type, but does not support it in any way. I am not saying the observations are invalid, but you have to support them. I don't see any support for his arguments that the symptoms and cause/underlying organ/gland are related.
I am not saying conventional medicine is always right or that unconventional approaches are wrong, but one should not masquerade as Doctors when you are not.