There are rare blood types beyond the eight most common ones, and researchers have discovered one more that brings the total count to 49. Blood type A(B) is caused by a four gene mutations and was ...

A person's blood type is determined by "the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body," according to American Red Cross.

Have you ever wondered if your blood type could influence the foods you should eat? That’s the idea behind the blood type diet, a nutrition theory that claims your ABO blood type (A, B, AB, or O) ...