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 »100 Calorie Pack Advertising Gimmicks by Dana Carpender
We have ads touting low calorie soup, low calorie cereal, low calorie yogurt, as opposed to that "high calorie" yogurt - you know, with a whole 100 calories per serving. Oh, and the soup is advertised as having only 80 calories per serving "and no fat." Welcome to the post-100-calorie-pack advertising gimmick.
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