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 »Gingerbread Muffin Mix with Splenda by Miracle Muffins
High Protein Gingerbread Muffins from Miracle Muffins. High Fiber Low Carb Gingerbread Muffins with Splenda.
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