How this book escaped me for so long, I have no idea. I was lucky enough to meet Dan Corrigan, Body Ecologist, at the Fourfould Path to Healing convention in Boston late last month, and I've been transformed by this book ever since:
Gut and Psychology Syndrome, by Dr. Natasha Campbell-McBride
While it's not about fermentation exactly, it is the best treatise I've ever seen on the importance of your gut flora. Honestly, this stuff should be taught in every health class in every school in every level everywhere. If the things Dr. Campbell-McBride teaches were understood, there would be such a change in people's attitude towards health.
Personally, I love it as well because it means that Zukay products are more valuable than I thought, and that my little side ferments are as well.
You can get used copies on Amazon, and at the website as well: www.gutandpsychologysyndrome.com