Your blood type means you have, or do not have, a specific component (A or B or both) in your blood. The purpose of typing blood is that people will have a serious reaction if they receive a transfusion from someone who has one of these components and you do not (your body sees it as an invader). In other words, if you are type O (which actually means you have neither A nor B--read as a zero) you cannot receive blood from someone who is type A or B.
Period.
This is the only relevance of blood type.
A diet for your eye color would make as much sense as a diet for your blood type. There is absolutely no science behind what you should eat based on whether you have one of these compounds that controls who you can safely receive blood from.
