The author sites 207 references in this book.
62 of those references are websites (~30%)
18 are newspapers and magazines (~7%)
32 are journals (~15%)
95 are other books (~46%)
First of all, think about that. 30% of the references in this book come from website information. Five of those 62 website references were Wikipedia. Wikipedia! One was Google Answers. I wont let my freshmen students use Wikipedia as a reference in their papers, why would it be acceptable for a book? Like websites, newspaper and magazine information needs to be taken with a grain of salt. Of the 32 journals less than half come from well known, peer-reviewed sources. The remaining 46% are books, which can truly say anything the author cares to print (as this one does) and only show that the author is getting her information from another source (and another opinion) aside from the primary one. The point of this is to make clear that this is a book that is sold as (and which many positive reviews hype as) providing scientific, factual, intellectual knowledge on the vegetarian/diet/health debate. In reality less than 8% of the book is coming from peer-reviewed, fact-checked sources which can provide unbiased, neutral information.
If anything I hope this review encourages people to get away from the bias on either side, find factual scientific sources instead of second-third-fourth hand knowledge, check information for yourself instead of blindly believing an author, and to question published material and push for it to actually be factual if it presented as such.