I personally met Dr. Rivas at an Expo for people with developmental disabilities. Already having a Phd in pharmacy, and havng tried all of the conventional medicine and treatment plans on his son with severe autism, he went back to school to become a functional medicine doctor.  He studied nutrition for more than a decade to understd the vital role it plays in imroving he symptoms of autism.  The results of the application of his research on his son have been astounding.  I met his son that same day.  He is a very impressive young man.  I would not have recognized him as having Autism.  Nutrition does make a difference.  This book is excellent and I have utilized the recommendation within, many  of which I was already practicing.