Goodbye early death: 269 centenarians analyzed and discovered the blood type that slows aging

A groundbreaking study has revealed a biological clue shared by many people who live to be 100—and it’s hiding in their blood.

In a recent expansion of a 2004 Tokyo-based study, researchers examined the blood of 5,000 volunteers, including 269 individuals over the age of 100 from the original study, to explore what might be slowing down their biological aging. Their surprising discovery? A strong connection between blood type B and reduced signs of premature organ decline.

What the study found: Blood type B may protect your organs

The research focused on biological age—a measure of how your organs are aging compared to your actual age—by analyzing over 4,000 proteins in participants’ blood. The scientists closely examined 11 major organs to identify early signs of wear and tear.

What they uncovered was striking:

Roughly 20% of participants showed premature aging in at least one organ, but individuals with blood type B consistently avoided this trend.

Why blood type B matters for aging

So, what makes blood type B so special?

People with this blood type have a B antigen on their red blood cells. This marker appears to shield the body from metabolic stress, which can damage organs over time. Not only that, but blood type B also seems to promote better cellular regeneration and an enhanced immune response, especially against threats related to blood type A.

In simple terms, if you have blood type B, your body may be better equipped to repair itself and fight off early aging—at least at the cellular level.

But here’s why that doesn’t tell the whole story

Despite these compelling findings, experts urge caution. The study, conducted in China, highlights a promising correlation—but not a guarantee.

Longevity is still largely shaped by lifestyle choices, access to healthcare, and your genetic makeup. Eating well, exercising, and managing stress remain the most proven ways to live a longer, healthier life.

And here’s something important for American readers to note:Blood type B is relatively rare in many Western populations. In places like Spain, and even more so in the U.S., blood types O and A are far more common. That means most people shouldn’t view their blood type as destiny when it comes to aging.

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