This is why someone with type A blood can’t receive a transfusion from someone with B blood type: The surface markers on the blood types are too different. When any invading cell enters your body your system flags as foreign, your immune system may attack it if it doesn’t recognize the surface markers. They let your body know which cells are yours, which ones are harmless, and which ones don’t belong there. These markers communicate with your immune system to keep you healthy. Your blood type is determined by the presence of antigens, or surface markers, on your cells. This standard system categorizes blood types into four groups: The blood type personality theory uses the ABO Blood Grouping System. However, this doesn’t mean that blood type is a “cause” of personality development.įor this reason, this study’s authors urged caution when interpreting the results as the personality link to blood type could be considered minimal at best.ĭespite the controversial nature of the blood type personality theory, Furukawa’s concept remains a widespread belief with many worldwide. In this way, researchers suggest that blood type may be tied to personality. In 2015, a study looked at personality through the lens of a relationship between blood type and genetics.Īccording to the study’s authors, certain blood types appeared to have a greater genetic probability of producing chemicals in the body that may influence impulsivity and sensation-seeking. Though most studies have shown that blood type doesn’t directly influence personality, some experts still believe there may be more to the story than what’s flowing through your veins. Is there any link at all between personality and blood type? Since this concept’s emergence in Japan in the late 1920s, the blood type personality theory has been the subject of many studies worldwide.Ĭurrently, no scientific evidence supports a cause-and-effect relationship between a person’s blood type and personality traits.Įven using current investigative methods, a 2021 study examining blood type and personality demonstrated no significant correlation. It was maintained and publicized by his son, Toshitaka Nomi, until Toshitaka died in 2006. Nomi added to the original blood type personality theory and suggested that blood type could be linked to disease or physical predispositions.Īnd like Furukawa’s work, Nomi’s report also came under heavy scrutiny for being uncontrolled and anecdotal.ĭespite this criticism, his outline for blood type personality theory remains the basis for current models. He included data from multiple method approaches, such as: In his report “Understanding affinity through blood type,” Nomi expanded on Furukawa’s concepts. It was brought to the scientific community a second time in the 1970s by independent researcher and journalist Masahiko Nomi. The theory of blood type personality persisted, however. After publication, the evidence was later questioned due to possible political influences and the too-small sample size used in the research. In his research, Furukawa linked personalities to different blood types.įurukawa presented preliminary statistics for his theory based on small population samples. Blood type personality theory was first introduced in 1929 when professor Tokeji Furukawa published “ A study of temperament and blood-groups.”
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