What if something as basic as your blood type could affect not just your health, but also your lifespan? A compelling study from Japan is stirring new conversations around genetics and longevity.

The Unexpected Connection Between Blood Type and Long Life

Japanese researchers conducted a study with 269 individuals aged 100 and over in Tokyo, comparing their blood types with over 7,000 other residents. The results were surprising: blood type B was significantly more common among the centenarians. This points to a possible link between type B blood and an extended life expectancy.

Backing this up, a separate study that examined the biological age of 11 organs across 5,000+ participants revealed that individuals with blood type B displayed slower signs of aging. This was likely due to better cellular repair and improved resistance to metabolic stress—both vital to aging more slowly.

Why Might Blood Type B Offer an Advantage?

Blood type B is marked by the B antigen and anti-A antibodies. This immunological setup might support better cell regeneration and stronger defenses against oxidative damage, which is closely tied to aging.

Additionally, some researchers believe that people with blood type B manage metabolic stress more efficiently. This could mean a reduced likelihood of age-related illnesses such as type 2 diabetes or memory decline.

The Caveat: It’s Not All Good News

Still, blood type B isn’t entirely risk-free. Some studies suggest a slightly increased risk of cardiovascular problems. Experts recommend that individuals with this blood type focus on heart-healthy habits: nutritious eating, regular activity, and stress management.

Blood Type and Your Broader Health Risks

Even beyond aging, your blood group might influence how your body reacts to diseases. While all humans fall under the A, B, AB, or O blood groups, determined by genetic inheritance, the surface molecules (antigens) on your red blood cells play a key role in how your immune system functions.

• Pancreatic Cancer Risk: People with type A, B, or AB may face a higher risk due to the way their red blood cell antigens interact with H. pylori bacteria, a known cancer risk factor.
• Heart Attacks & ED: Non-O types (A, B, AB) may have thicker, stickier blood due to higher levels of von Willebrand factor. This increases risk for heart attacks, strokes, and even erectile dysfunction in men.
• Infections: While type O blood protects better against malaria, it may be more prone to strep infections due to differences in sugar structure on the cells that allow bacteria to bind more easily.
• Can Diet Be Tailored to Your Blood Type?

The Blood Type Diet, popularized in Eat Right 4 Your Type by Dr. Peter D’Adamo, claims specific foods are better suited to each blood type based on ancestral history.

• Type A (“The Cultivator”): Best suited for a vegetarian diet rich in whole, organic plant-based foods.
• Type B (“The Nomad”): Encouraged to eat most meats (excluding chicken), dairy, and a variety of plants, but should avoid corn, wheat, and tomatoes.
• Type AB (“The Enigma”): A mix of A and B diets, with emphasis on seafood, tofu, and greens, while avoiding red meat and caffeine.
• Type O (“The Hunter”): Advised to follow a high-protein plan—similar to paleo—featuring meats and vegetables, avoiding grains and dairy.