Yes, I am O.  I read somewhere that that means that I am the original meat
eatin' type.  I'm guessing that most paleo eaters would be O's since we
eat need meat.
 I do think that people are at an "in between" point in evolution.  Some
need milk, others become debilitated by it.  I just don't know if one's
blood type is a reliable indicator of the degree of evolutionary needs.