Because bl00d group antigens sit on cell surfaces, they can influence how the body interacts with bacteria, viruses, and even canc3r cells. This may contribute to differences in disease susceptibility across blood types.
Why the Evidence Remains Unclear
Even though these theories are plausible, most studies only find small associations, not strong cause-and-effect relationships.
Lifestyle and environmental factors such as diet, exercise, smoking, stress, medical access, and socioeconomic conditions, have a far greater impact on longevity than blood type alone.
Additionally, bl00d-type frequencies differ across regions and ethnic groups, which makes it difficult to generalize results from one population to another.
