In Japan and other parts of Asia blood types are considered an important indicator of a person's personality. This is known as the “Blood Type Personality Theory."

According to a recent study in Japan 74.8 percent between ages of 20 and 49 believe in this theory.

These beliefs even affect politics. One former prime minister considered it important enough to reveal in his official profile that he's a blood-type A, whilst his opposition rival was a blood-type B

In 1990 the Asahi Daily newspaper reported that Mitsubishi Electronics had announced the creation of a team composed entirely of AB workers, thanks to "their ability to make plans".

Facebook and many other social media sites in Asia allow you to add or edit your blood type, which, supposedly, helps others to learn more about you.

The theory suggests that one’s ABO blood-type can predict their:


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