Throughout the years, Japanese researchers have been particularly interested in finding a link between the 4 main blood groups A, O, B and AB and the personalities of their holders.

Fascinatingly, for decades, blood typing has been used in their culture by:

– Employers when assessing job candidates,
– Dating services for potential love matches,
– And even companies for marketing soft drinks and other products.

The researches conducted more than 60 years ago have returned many different answers, some depending on countries’ populations and “racist” beliefs (thereby U.S. researchers had assigned the B blood type, common in Asia, the characteristics of weak and inferior to them) and some others based on genetics, believing it is there where the most correct answer lies.

In Japan and other eastern countries, the “ketsueki-gata” or “blood type” is predictive of a person’s personality, temperament, and compatibility with others, similar to how astrological signs are used in other countries throughout the world. Morning television shows feature blood type horoscopes, and similar horoscopes are published daily in newspapers. The country’s obsession has grown to a certain extent that a series of four books describing people’s character by blood type ranked third, fourth, fifth and ninth on a list of best selling books in Japan in 2008 compiled by Tohan Corporation.

Moreover, some other studies suggested that because blood is the most fundamental nourishment for our bodies, it seems that different blood types would react differently to certain substances in food, thereby assessing that each blood type had particular food preferences.

All in all, here’s what is commonly said about each blood type, prominently in the Japanese culture, based on James and Peter D’Adamo’s work:

Blood Type A – Tend to be cooperative, sensitive, clever, passionate and smart. Often bottling up anxiety in order to get along with others, they may hold in their emotions until they explode. Many are tense, impatient and unable to sleep well. While they are capable of leadership positions, they may not take them because the stress is not good for their tightly wired systems. In Japan many “A”‘s are in research. They have roles in discovering more about and refining science, economics, manufacturing, etc. Their research on microflora and other areas of medicine is some of the best and most meticulous in the world. They are perfectionists to say the least. This quality shows up in their perfecting electronics like TV’s and also less expensive more efficient cars that were originally created here in the US.

Blood type A’s tend to have more sensitive constitutions. Too much stress weakens their immunity more quickly than other blood types. Low stomach acid is common among blood type A’s even from birth, so special care should be taken when eating animal proteins. They also eat raw fish which is much easier to digest than cooked. Using digestive enzymes, along with consuming fermented foods and drinks is really a must for A’s.


Blood Type B – Tend to be balanced: thoughtful like A’s and yet ambitious like O’s. They are empathetic, easily understanding others’ points of view, yet often hesitating to challenge or confront. Chameleon-like and flexible, they make good friends.

Peter D’Adamo found that while their immunity is strong, they are more prone to slow-growing viral infections like lupus, MS and chronic fatigue.

They may also have problems with hypoglycemia and blood sugar, especially if they eat the wrong foods.


Blood Type AB – Tend to be very charming and popular. They don’t sweat the small stuff and can be seen as spiritual and even at times a bit “flaky”. Only about 2 – 5% of the population are blood type AB. There is never a dull moment in a AB’s life, so if you find one for a friend, consider yourself lucky! Youll enjoy some exciting times together!

Like blood type A’s, AB’s react to stress poorly. They are stronger and more active than type A’s, but need to pay attention to stress levels so that they don’t compromise their immunity.

Sometimes it is difficult to be an AB. AB’s don’t like to fit in anyone else’s “boxes”. If they feel too confined, they’ll break out of that box and do things their own way. When it comes to food choices and AB must discover when they are more B-like or A-like. For example, dairy foods like milk kefir can be excellent for them or not good at all.


Blood Type O – Tend to be loners or leaders and are intuitive, focused, self-reliant and daring. They handle stress better than other blood types and have strong immune systems, a well developed physique and a physically active nature. Blood type O’s tend to have sluggish blood flow and feel better with vigorous exercise for about an hour each day.


After reading this, does your blood type match your personality? 😉

 Share with us your thoughts!

One thought on “Can you blood type predict your personality?

  1. Niiiceee!
    One question though..doesn’t the resus (Rh + or -) have any influence on the personality? 😀

Leave a Reply to Karim Cancel reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s