The connection between blood type and personality of an individual has been a topic of interest in several Asian countries. However, the origins of this concept lie in the Japanese culture, and is termed as the ‘Blood Type Theory of Personality’, which emphasizes that a person’s blood type can be useful in predicting his personality, general disposition and his rapport with others.
The relation between ABO blood types and personality was studied and brought to life by Mashiko Nomi, a Japanese journalist, in the 1970s. Nomi’s interest was sparked by a paper titled The Study of Temperament Through Blood Type, published by Takeji Furukawa in 1927, in the journal Psychological Research. Although lacking a strong scientific explanation, and being dismissed by members of the scientific community, popular belief subscribes most wholeheartedly to this concept.
Various personality traits associated with the four different blood types under the ABO system, have been provided below.
Although the correlation between blood types and personality has no scientific evidence, the idea had become the basis for scientific racism. Those in the West labeled individuals with the blood type B, the most common blood type amongst Asians, as inferior. Moreover, during the early 1900s there was widespread propaganda suggesting that there existed a ‘superior’ blood line characterized by A type of blood.
Today, the relation between blood type and personality is followed closely in Japan, much like the use of sun signs to determine personality and compatibility for matchmaking.