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The best book on Plant Based Nutrition is probably "The China Study". Here is the website
http://www.thechinastudy.com/
and you can buy the book on Amazon.com
http://www.amazon.com/China-Study-Comprehensive-Nutrition-Implications/dp/193...
or Amazon.co.uk
http://www.amazon.co.uk/China-Study-Comprehensive-Nutrition-Implications/dp/1...
As of writing there are 650 Amazon USA reviews and 29 Amazon UK reviews. From one of the UK reviews:
"Campbell is no pie-in-the-sky visionary or nutritional quack with a bogus agenda, nor is he an animal rights activist trying to find justification for his concerns. He is a bonafide mainstream scientist with forty years of experience who is currently Professor Emeritus of Nutritional Biochemistry at Cornell University. Furthermore, he grew up on a farm, and prior to his learning about the effect diet can have on human health, he ate a more or less traditional American diet heavy on the meat, milk, fat, refined sugars and starches."
However, it is a heavy read, it was written by a scientist not someone with the intention to sell books. Bith Amazon sites allow you to read parts of the book and you can also find a 7 page excerpt here
http://www.thechinastudy.com/PDFs/ChinaStudy_Excerpt.pdf
As a matter of fact this is one of only two books I know that had a virtually zero advertising budget, the other one was "The Shack". I read that the other day but can't find the reference now. The readers find the books so compelling they buy copies and give them away or persuade others to buy them.