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 »Belinda’s Sugar Free Gelatin Mix DISCONTINUED BY THE MANUFACTURER
Belinda's Sugar Free Gelatin Mix DISCONTINUED BY THE MANUFACTURER. Belinda's is no longer available for purchase.
Read More »