“Type O is the oldest and the most common type. About 40,000 BC our ancestors in southern Africa had weapons and tools and they hunted in packs. They were hunter-gatherers, who thrived on meat, which led to their digestive characteristics. In time, hunting grounds became depleted of big game. To survive, the human race migrated to northern Africa. Eventually good hunting there was eliminated leading to migration out of Africa into Europe and Asia. Thus, the basic population of the planet was type O for “old.” In time, depletion of large game in Europe and Asia occurred so different kinds of food were needed. Our ancestors survived on berries, small game, nuts, grubs, and fish. Overpopulation by early man led to increasing competition for the remaining meat, which led to war and further migration.
According to D’Adamo, type A first appeared in Asia or the Middle East between 25,000 and 15,000 BC. Type A mutated from type O because the increased population and major diet changes resulted in many infections. This mutation occurred rapidly. The gene for type A thrived. Characteristics of the culture were agriculture and the raising of domesticated animals. Dietary and environmental changes led to further digestive and immune system mutations. People became better able to absorb and tolerate grains and other agricultural products. They were able to sustain themselves and stable communities arose, which led to networking and cooperation. Eventually the type A gene spread into Western Europe.
Type B (for balance) developed between 15,000 and 10,000 BC in the Himalayas. Changes in climate from hot East Africa to the cold Himalayan highlands may have brought about the mutation to type B. It was characteristic of the Steppe dwellers of the Eurasian plains. Some of these were nomads, who penetrated far into Eastern Europe; while others, agriculturally based, spread through China and Southeast Asia. Movement of type B into North America was prevented by the disappearance of the land mass between it and Asia. Earlier populations in North America were all type O.
Type AB is found in less than 5% of the population and did not exist prior to between 900 and 1,000 years ago. When eastern Mongolian invaders overran the last of European civilization, type AB came into existence. AB’s inherited the tolerances of A and B, which gave them enhanced ability to counteract infections, allergies, and immune diseases. However, they have some increased susceptibility to certain cancers.”