To clarify, she uses sources whenever making a valid claim. Conversely, her claims regarding vaccines and GMOs conveniently don't include a source in the back of the book.

The question I should have asked is, is there any risk involved with reading these books? For example, is the nocebo effect likely when reading a book that suggests dairy and coffee cause serious health ailments. How do we think critically about claims without allowing them to affect us?

To be honest, I'm in the process of learning critical thinking. I was raised LDS which taught that critical thinking is a sin. We were supposed to make gut feelings and wait for a "burning in the bosum" to tell us what's true.