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.
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Grace Island Specialty Foods is based in northeastern Indiana. Kalista, her family, and her company are dedicated to making wholesome and delicious products by using locally produced ingredients, as well as taking the utmost care manufacturing their products in their state-of-the-art, grain-free commercial kitchen
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