The search results confirm that blood type personality theory is widely popular in East Asia, especially Japan, Korea, and Taiwan, despite a lack of scientific evidence. Several sources (e.g.,,,,) explicitly state that scientists and psychologists argue there is no evidence to support a correlation between blood type and personality. Source (2014) mentions a large-scale survey in Japan and the US found no relationship. Source (2025 update) and (2026 update) reiterate the lack of scientific support while highlighting its cultural impact. Source (2022) is interesting as it claims a “clear relationship between ABO blood type and self-reported personality traits on several single question items, consistent with the predicted ones” in a pilot study (N=1,937) in Japan, even for a “no knowledge” group. However, it also notes that “research using the Big Five personality tests has shown no consistent differences in Japan, Korea, or Taiwan.” This provides a nuance: while large-scale, robust personality tests don’t show correlation, some specific self-reported items *might* show consistency with stereotypes, possibly due to cultural priming or self-fulfilling prophecy (though the study claims to disprove “self-fulfillment phenomenon”). I will cite the general scientific consensus and perhaps briefly mention the nuanced findings from such studies without giving them undue scientific weight.

10 月 13, 2026 | General