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 »Delilah’s Mirror Episode 11: Hypoglycemia
It wasn't until I read The Diabetes Solution by Dr. Bernstein that I realized I had had hypoglycemia for years. Only my problem was I only got mean (and I mean a killing rage) when my blood sugar tanked. I never made the connection then, but I do now.
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