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Originally Posted by Jinn
For what it's worth, there is a sizeable amount of evidence linking Blood Type and genetic precursors for the 'ability' to be vegetarian or not.
[Eat Right 4 Your Type] was an interesting book. I didn't read it so much for the dieting instructions, as most diets have a great deal of 'fad' to them, but because it continued a series of research about health, blood type, and meat consumption.
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From what I understand, this theory is still largely undocumented and lacks clinical trials. I've read more than one source of medical doctors stating that the claims of this diet have no evidence of any certainty.
I've even read that the author has gotten it wrong when it comes to the history and evolution of blood types. It's possible that he's corrected this in subsequent editions, and it's great that there is research going on, especially if there is any validity to it, but there isn't enough credible evidence to suggest that we need to eat these ways based only on what blood type we are.
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I'm definitely one who cannot subsist on an "agrarian" diet. Even taking the necessary supplements, I become noticeably less coordinated and irritable if I don't have a high-protein meat source every 2-3 days.
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I used to think this of myself as well. But I figured out that the main reason why I would crave meat is because my diet wasn't balanced or wholesome enough. It's the same idea where people crave sugar only because they haven't been eating enough complex carbohydrates (glucose vs. starches). Your body demands things in response to what is lacking, and these demands are usually reactionary rather than geared towards long-term applications.
I remember on a number of occasions where I'd crave meat ravenously. I think it's because I wasn't eating enough protein in general, or maybe because I wasn't eating enough calories in total. I don't think it could be attributed to any form of protein specifically, whether it be plant or animal derived.
Cravings can also be psychological. We crave things we have enjoyed in the past. I've craved hamburgers and fries a number of times. I don't think there is anything in our evolutionary makeup that would suggest we are programmed to crave hamburgers and fries.
It's interesting, though. I still crave hamburgers and fries, and soy burgers do the trick just as well as cow burgers.