In case you didn't know already, fad "Blood Type Diets" never made any sense or had any scientific support.
Excerpt from No science behind blood-type diets:
But no peer-reviewed research has indicated that eating foods supposedly compatible with one's blood type will improve health or induce weight loss more than a general diet plan.
Medical professionals already knew this, according to the study's senior author, Dr. Philippe Vandekerckhove at the Belgian Red Cross-Flanders in Mechelen.
"However, the general populace have access to blood type diets, regardless of medical guidance, and cannot be expected to be able to determine whether or not the health claims are, in fact, ‘evidence-based'," Vandekerckhove told Reuters Health.
Blood type is determined by proteins on the surface of red blood cells and antibodies in the blood. The most familiar grouping, known as ABO blood types, refers to whether a person's cells carry the proteins known as A or B, or both of them, or neither of the two – which is designated blood type O…
"Eat Right 4 Your Type" by Peter D'Adamo has more than 7 million copies in print, and outlines a theory about which foods are best for people with the various ABO blood types to eat and which to avoid…
Full article: No science behind blood-type diets – Yahoo! News Canada.