Blood Type Diet recommends specific food groups and lifestyle choices for each individual blood type. The four blood types are: A, B, AB and O. Based on studies of human evolution, the Blood Type Diet teaches that our eating and diet choices should take into consideration our individual genetic codes told by our blood type. For example, based on our genealogy, people of A blood type are natural vegetarians, while O blood types are considered carnivores. Each of the four blood types has a lifestyle guideline plan that includes food selection, supplement program, exercise, and susceptibility to disease based on each blood type’s biological pre-disposition.