The four major blood groups are based on whether or not you have two specific antigens — A and B. Doctors call this the ABO Blood Group System. The third kind of antigen is called the Rh factor.

Blood types are genetic and cannot be changed. There are four types of blood groups: A, B, AB, and O. Nutritionist and Psychiatrist Dr Sheldon Zablow sheds light on how our blood type can ...

People with one of the type A blood groups are more likely to have a stroke before the age of 60 compared with people with ...