I'm sure there's a lot of helpful information in the book, but I was really put off by the fact that she's started referring to Weston Price's X-Factor as "Vitamin K2." As I understand it, this is just a theory, based on one layperson's reading of the available literature (I was on the native-nutrition Yahoo group when this was being discussed a few years back). There are some interesting parallels, but it's hardly an open and shut case. When she presents this in such an unguarded way -- saying
"researchers have finally identified..." -- it really diminishes her credibility as a source of reliable scientific information, IMO.
I'm not sure if she does this in the book or just on her web site, but either way, it's a concern. I've seen posts online in which people are talking about buying K2 supplements or eating other K2-rich foods, rather than taking the special butter oil, when in fact there's no solid evidence that this would be effective. Not that she's recommending this approach, AFAIK -- but given what she's written, it's not surprising. It would be a real shame if her enthusiasm turned out to be leading people astray.
(For those who are interested in the X-Factor/Activator X issue, I'd be very happy to discuss it elsewhere. I was really surprised when people started acting like "hey, mystery solved!," just because someone had written a somewhat convincing article. I'd guess that the guy who wrote the article was probably surprised by the reaction, too.)