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the claim
Blood group can affect human behavior
the verdict
CONTESTED
contested - the weight sits with the supporting side
refutedsupported
the weight of evidence
3 sources for · 2 against

Evidence regarding whether blood group affects human behavior is contested. While some survey-based studies and machine learning analyses report statistically significant associations between blood types and certain personality traits, other empirical studies find no meaningful correlation.

The evidence we hold leans leans supported

How this was weighed

official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x

  • ABO Blood Type and Personality Traits: Evidence from Large-s · peer-reviewed · supports · weight 1.05 · 2020
  • Obsessional Personality Traits and ABO Blood Types · peer-reviewed · supports · weight 1.05 · 2008
  • AI-based Analysis on Relationship between Genes and Personal · peer-reviewed · supports · weight 1.05 · 2021
  • Association between ABO Blood Group Phenotype and Reaction t · peer-reviewed · refutes · weight 1.05 · 2019
  • Is there a correlation between A, B, and O blood group syste · peer-reviewed · refutes · weight 1 · 2025
Evidence for · 3
ABO Blood Type and Personality Traits: Evidence from Large-scale Surveys in Japan with AI
2020 · cited by 3
This study analyzed large-scale survey data and found statistically significant associations between blood type and personality traits, with AI able to predict blood types from personality responses above chance levels.
Evidence against · 2
Association between ABO Blood Group Phenotype and Reaction to Academic Stress in Young Medical Students
2019 · cited by 2
This cross-sectional study found that physical, academic, environmental, and interpersonal stressors had a negative and insignificant relationship with blood groups.
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The analysis

The retrieved literature contains conflicting findings regarding the link between ABO blood type and human behavior or personality. Papers [1], [4], and [7] report positive associations and predictive relationships in large surveys. Conversely, papers [3] and [9] explicitly find no significant relationship or correlation between blood groups and behavioral measures like academic stress or dental anxiety. Since there is direct disagreement within the provided sources, the verdict is CONTESTED.

More for · 2
Obsessional Personality Traits and ABO Blood Types
2008 · cited by 2
Research examining obsessional personality traits found a significantly lower incidence of blood type O and a higher incidence of other types among high scorers, suggesting a link with personality characteristics.
AI-based Analysis on Relationship between Genes and Personality
2021 · cited by 1
Using machine learning, this study found that respondents' blood types could be predicted with higher-than-chance probability based on specific blood-type personality trait scales.
More against · 1
Is there a correlation between A, B, and O blood group system and dental anxiety in pediatric dental patients? An observational study.
2025 · cited by 0
This observational study found no correlation between dental anxiety—a behavioral and psychological measure—and ABO blood grouping.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → CONTESTED · 3504 Aug 2026
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