I don't buy it.
I'd like to see these studies you refer to.
Bloodtype is determined by the presence or absence of agglutinogens, which should have nothing to do with metabolism. The only possibility I can think of is if they interact with glucose in the blood in some special way -- which seems doubtful to me.
There are lots of things that make people different besides bloodtype. It's just that bloodtype is easy to test for. You may as well base a diet on one's RBC or hemoglobin count.
Nevertheless, if it works for you that's great.
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