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 »Review: Nature’s Best Perfect Isopure Whey Protein Powders by Amy Dungan
I think it's safe to say I've become a protein powder connoisseur. I've found it useful in various recipes, as well as its traditional use for shakes. One thing I've learned the hard way is that you get what you pay for. This is especially true when speaking of protein powder.
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