http://www.doctor-natasha.com/gaps-book.php
https://www.medicalnewstoday.com/articles/325046
https://www.goodreads.com/en/book/show/978904.Gut_and_Psycho...
http://www.doctor-natasha.com/gaps-book.php
https://www.medicalnewstoday.com/articles/325046
https://www.goodreads.com/en/book/show/978904.Gut_and_Psycho...
I think her whole scheme is dangerous and would recommend everyone who's considering this diet to look at the negative press around the diet and its proponent. You'll have to look pretty deep into google results to find those, but they're there. I'm not linking them because I'm not qualified to judge their quality besides superficially.
When the healthcare establishment shrugs its collective shoulders and tells you that your son is condemned to a life of physical suffering, and being trapped in his own head, you don't wait for the 'experts' to publish studies. You go to work.
The subjects of the article did the first high-quality research on this topic in humans.