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 »How I Learned the Value of Uncomfortable Exercise
Success stories usually feature those who have run a race, not those who are still running. For the first seven years after reaching my goal weight, staying there was remarkably easy. I had lost over 200 pounds on the Atkins Diet in 2004/2005 and kept it off without much problem.
Read More »