Type A History The Type A emerges into the 21st century with many more complex challenges than their ancestors could have imagined. The key factor in the development of Type A can be traced to the struggle for survival long ago, when there was a rapidly dwindling supply of hunting game stock. Having exhausted the great game herds of Africa, humans pushed farther out from their ancestral home into Europe and Asia. The cultivation of grains and livestock changed everything. For the first time, people were able to forego the hand to mouth lifestyle of the hunter/gatherer and establish stable communities. Over time the adaptations that produced
Blood Type A were based on the need to fully utilize nutrients from carbohydrate sources. These biological adaptations can still be observed today in Type A's digestive structure. Low levels of hydrochloric acid in the stomach and high intestinal disaccharide digestive enzyme levels permit the more efficient digestion of carbohydrates. According to Dr. D'Adamo, these are also the very factors, along with low levels of intestinal alkaline phosphatase, that make it difficult for Type As to digest and metabolize animal protein and fat.
