Ketsuekigata is a Japanese pseudoscience based on human blood types. There is a popular belief in Japan that a person’s ABO blood type is predictive of their personality, temperament, and compatibility with others. Ultimately deriving from ideas of historical scientific racism, the popular belief originates with publications by Masahiko Nomi in the 1970s. The scientific community dismisses such beliefs as superstition. Discussion of blood types is widely popular in women’s magazines as a way of gauging relationship compatibility with a potential or current partner. Morning television shows feature blood type horoscopes, and similar horoscopes are published daily in newspapers. In addition, a series of four books that describe people’s character by blood type ranked third, fourth, fifth and ninth on a list of best selling books in Japan in 2008.
Although there is no proven correlation between blood type and personality, it remains popular with the many matchmaking services that cater to blood type. In this way, it is similar to the use of astrological signs in the West, which is also popular in Japan. Asking one’s blood type is common in Japan, and people are often surprised when a non-Japanese does not know his or her own blood type.
The Daily Omnivore 
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