Should blood type change how you eat?

A Fad - Probably Not: Blood type refers to thousands of proteins & glyco-proteins on the surface of cells, especially red blood cells. Abo and rh types refer to only the first 2 & most important (in terms of transfusion reactions) characterized historically. There are hundreds more "types", the reason blood cross-typing is always performed before transfusions. Types reflect genes - but clear basis for selecting foods.