Okay, I haven't actually tried this one, but I find the theory very fascinating. Simply stated, it says that your blood type dictates what type of food you should eat. The rationale is that blood types evolved with our species--type O was the first, A, B, and AB came later. As we evolved, people possessing each blood type evolved an affinity for certain foods based on what was available during their epoch and in their geographic area.
I haven't tried this diet or read the book, but perhaps because I thrive (as predicted) on meat, the theory makes sense to me. For more info:
http://www.dadamo.com/napharm/store3/template2/encyclopedia.html
http://www.curezone.com/diet/bloodtype.html
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