I adored the majority of Dr Monty Lyman's The Immune Mind, but the final section lets it down. For most of the book he's talking about fascinating research, which is pretty well sourced and matches what I can easily fact check (in part because I can always ask my mother's opinion of What's Going On With Schizophrenia research, with which she's been involved for years as a psychiatrist and investigator). 

That part was fascinating and exciting: I can report that as recently as right now, infectious diseases and immunology classes are still teaching that the brain is an immune-privileged site where no immune reactions can occur -- at the London School of Hygiene and Tropical Medicine, no less. What he says on that front makes absolute sense, and my knowledge agrees  with what he says as far as my it goes (BSc in natural sciences, near completion of MSc in infectious diseases, general voracious curiosity). 

Buuut the chapters about how improving your health felt pasted on, like someone told him that you can't finish the book on the point that we may understand the mechanisms behind some diseases yet, but you can't get treated for them because it's still experimental. It's basically regurgitating exactly the same advice you find elsewhere, and the authorities he quotes have been... questioned. (See Alexey Guzey's essay, which at the very least asks some pertinent questions: https://guzey.com/books/why-we-sleep/)

So that was a bit disappointing, because the rest of the book was pretty fresh and exciting.