O+, sp/sx so incorrect (either the OP is or I am about my instincts).
I haven't heard much about it being correlated with personality, but I have heard of eating according to your blood type. http://www.dadamo.com/
I haven't read the book. Actually this site describes the associated personalities somewhat- type O is a lot like EXTJ. It said O types score higher in "thinking" and "sensing" and tend to be extroverts, organized, and decisive. Type O is described as a primitive predator concerned with survival; well, I am kind of a prehistoric person and I value trying to live like one, but I'm not an EXTJ.
Edit: Just read the diet recommendations for O and I think they are completely wrong for me.
Heh, read a book on blood type diets once, the only thing that worked for me was the type A "working well" with being vegetarian thing, I'm just not supposed to eat meat. Otherwise no, I'm Sp last and A+ (as chana pointed out, clearly the best) so that doesn't work.
Like astrology, it's broad, vague and supposed to be able to fit most anyone in there if they want to fit.
. Type O is described as a primitive predator concerned with survival; well, I am kind of a prehistoric person and I value trying to live like one, but I'm not an EXTJ.
I'm sorry... .the first thing I thought when I read about a "primitive predator" person is someone catching fish with their bare hands and eating them raw. So what is that like? Is there a lot of patience required to catch a fish raw?