You refer to D'Adamo, and sorry but that's a load of horse manure. Even the other fringies reject his ideas. Read
this article for example. Seriously L, you should stop believing everything you read on the internet
You are correct when you say that DNA and biological markers have been used to map human evolution, however...... Using D'Adamo and his lunatic theories and diets, is destroying any credence you just build up. Medical experts universally agree that the D'Adamo theory is nonsense, and say there is absolutely no link between our blood group and the diet we eat.
Also, based on D’Adamo’s theory, We should have evolved a blood type F! People with blood type F will need lots of fast food, takeaways, pizza, sugary snacks, crisps and chocolate to remain in tune with their environment. After all, if the theory is correct, surely that’s what we have to expect, based on what many of us eat.