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Study Reveals Blood Type A Linked to Higher Stroke Risk

9/30/2025

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Summary

Story summary

A meta-analysis of 48 studies (17,000 stroke patients, 600,000 controls) links blood type A to higher stroke risk before 60.
A1 carries a 16% increased risk; O1 has a 12% lower risk.
Type B blood shows an 11% increased risk regardless of age.
Most strokes occur at 65+, with risk doubling after 55. Diverse populations are needed to clarify mechanisms.

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Story summary

A meta-analysis of 48 studies (17,000 stroke patients, 600,000 controls) links blood type A to higher stroke risk before 60.
A1 carries a 16% increased risk; O1 has a 12% lower risk.
Type B blood shows an 11% increased risk regardless of age.
Most strokes occur at 65+, with risk doubling after 55. Diverse populations are needed to clarify mechanisms.