The mechanics of blood type’s influence have to do with the way the genes influence one another. This mechanism explains why your blood type can have an impact on such a diverse number of bodily systems and from digestive enzymes to neuro-chemicals.
Many nutrition experts are baffled when they first hear about the link between blood type and digestion and that is because they are only considering the physical significance of blood type as a surface antigen.
Actually, it is not your blood type antigen that is influencing the level of acid in your stomach, but rather the gene for your blood type influencing other seemingly unrelated genes located immediately adjacent, or very close to the ABO blood type gene that can exert an effect on your stomach acid levels. This phenomenon is called gene linkage, isn’t well understood yet, but it has become well-known. Many genes influence the actions of other seemingly unrelated genes, as we explore blood type B we will learn about this intriguing relationship.