So far as I know, the oldest in the English language at least, is Banting's Letter on Corpulence. Having lost weight and dramatically improved his health on a low carbohydrate diet. Banting wrote and self-published the book back in the Mid-Victorian era, and he distributed it for free.
Read More »Genocide! How Your Doctor’s Dietary Ignorance Will Kill You by Dr. James Carlson
Dr. James Carlson points out the problems with current medical thinking. I highly recommend this book for anyone who wants to learn more about the role of dietary nutrition in healthcare.
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