3 Diets for 3 Blood Types 

Some scientists have come up with a diet for which one should use based on his or her blood type.  If you use the Mitochondrial eve theory, one can possibly see where this diet originated from.  As the population spread from central Africa, the nutrients needed for survival evolved as well along with the blood types of the people who migrated from the central location of civilization. Most of the population has blood type O. Here the prescribed diet is low-carbohydrate, high in proteins (such as meat and fish), and low in dairy products. There are specific foods to avoid; such as avocados, brazil nuts, and oranges. Type O should also engage in lots of exercise.  Blood Type A should avoid red meat, eat plenty of fish and vegetables, with a low dairy intake. Light exercise only.  Blood Type B should avoid chicken and bacon, eat plenty of meat and dairy, some fish, and plenty of fruit and vegetables.

Blood Type AB combines the A and B diets.