I follow the diet for type O. This is the oldest and most common blood type and is a universal donor.
I try to follow a mostly hunter-gatherer diet, avoiding all grains... though every now and then I eat rice.
I also try to Zone, so I'm including a certain balance of protein in every meal as well. Here I slide sometimes, but I never deviate from eating foods that are beneficial to my blood type and avoiding the ones that are not.
It's amazing how well this diet works for me. The minute I deviate, I get inflammatory pain. The second I go back to it, the pain goes away. And what I learned about dealin. with arthritis had enabled me to eliminate all pain and stiffness. For type O, that means avoiding chondroitin sulfate completely, taking only glucosomine, boswellia, and curcumin. I can't believe how lucky I was to find that information.
I owe a huge debt to D'Adamo and the research on blood types.
It's true that type AB is the latest and could not have been on Jesus' shroud.
Blood types are also indigenous to certain areas. I think type A arose with agriculture, and type B mostly in northern countries like Scandinavia that relied on dairy. Thus, many people who are type O cannot digest milk, especially people in and from Africa. I seem to be able to digest dairy OK, but I mostly avoid it for other reasons. I do eat cheese occasionally and it doesn't cause problems. Corn is a major culprit, so I have to really watch food and drink labels for high fructose corn syrup. I have to make sure that sweeteners come strictly from cane sugar or natural fruits that are right for my type. This is so difficult that I can only get them at Whole Foods right now. That's where I do all my food shopping. It hurts financially a bit, but actually saves me money in the long run on my health.