I recommended this book to my sister-in-law, who is something of a neuroscience buff, after finishing it several weeks ago. Grain Brain ties in nicely with Davis' Wheat Belly (the covers are even alike!), but having a history of dementia and Alzheimer's in the family, I was looking for something more specific about feeding the brain. Depending on your familiarity with the science (mine is pretty minimal), the technical writing, in places, bogs down an otherwise good read.
The price on Kindle was reasonable at $6.49, or like my S-I-L, check it out at the library.