Can Your Blood Type Affect Your Personality? (2023)

The Japanese theory of ketsueki-gata attempts to explain personality traits through physiological factors such as blood type.

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Personality is made up of many different elements, such as creativity, social preferences, and temperament.

Ourpersonalitythey are what make each of us unique. But if you believe in the blood type personality theory, you might think that you share these traits with other people of the same blood type.

For centuries, many people around the world have turned to astrology to attribute certain personality traits to the planets and stars. Is the idea of ​​a relationship between blood type and personality that far-fetched?

This concept is attributed to "ketsueki-gata", a Japanese theory that first emerged in the early 20th century. And while this concept remains unconfirmed by the scientific community, the blood type theory of personality helped pioneer research linking psychology with physiology and biology.

The blood type personality theory is a Japanese concept officially known as ketsueki-gata. This idea suggests that your personality traits may be related to one of the fourblood groupin the ABO blood grouping system.

According to the theory, the surface differences of the blood cells in each blood group can cause different biological responses that make up your personality.

The blood type personality theory was first introduced in 1929 when Professor Tokeji Furukawa published a book entitledTest of temperament and blood groups»

(Video) What Does Your Blood Type Say About Your Personality?

In his research, Furukawa linked personalities to different blood types.

Furukawa provided preliminary statistical evidence to support his theory based on small population samples. After publication, the figures were later questioned due to possible political influence and the very small sample size used in the study.

However, the blood type personality theory persisted.

It was first introduced to the scientific community in the 1970s by independent researcher and journalist Masahiko Nomi.

In his report "Understanding Kinship Through Blood Type", Nomi developed Furukawa's concepts. It included data from a multi-method approach, including:

  • questionnaires
  • investigations
  • observational
  • Statistical analysis

Nomi built on the original blood type theory of personality and proposed that blood type could be related to diseases or physical predispositions.

Like Furukawa's work, Noma's report has been largely scrutinized for being wild and anecdotal.

Despite these criticisms, the outline of the blood type personality theory remains the basis of current models. It was maintained and published by his son, Toshitaka Nomi, until Toshitaka's death in 2006.

Since the concept emerged in Japan in the late 1920s, the blood type personality theory has been the subject of much research around the world.

There is currently no scientific evidence to support a causal relationship between blood type and a person's personality traits.

Even using current research methods, 2021testBlood group and personality testing showed no significant relationship.

Is there a relationship between personality and blood type?

While most studies have shown that blood type doesn't directly affect personality, some experts still believe there may be more to the story than what's running through your veins.

(Video) What Your Blood Type Says About Your Personality

w 2015 rtesthe viewed personality through the prism of the relationship between blood type and genetics.

According to the authors of the study, certain blood types appear to have a higher genetic probability of producing chemicals in the body that they may haveimpulsivenessand sensation seeking.

Thus, scientists suggest that blood type may be related to personality.

However, this does not mean that the blood type is the "cause" of personality development.

For this reason, the authors of this study recommend caution in interpreting the results, as the relationship between personality and blood type can be considered minimal at best.

Despite the controversial nature of the blood type theory of personality, Furukawa's idea remains a common belief among many people around the world.

The blood group theory of personality uses the ABO blood group system. This standard system divides blood groups into four groups:

  • blood group a
  • blood group B
  • AB blood group
  • blood group O

Your blood type is determined by the presence of antigens or surface markers on your cells.

These markers communicate with the immune system to keep you healthy. They tell your body which cells are yours, which are harmless, and which are not.

When any invasive cell enters your body, your system marks it as foreign, your immune system can attack it if it doesn't recognize the surface markers.

Therefore, a person with blood group A cannot receive a transfusion from a person with blood group B: surface markers in blood groups are very different.

Not only do surface antigens help with the body's immune response, the blood type theory of personality also suggests that they are responsible for the traits you express through your personality.

(Video) Why do blood types matter? - Natalie S. Hodge

These characteristics can be of different importance from person to person and often contrast with opposing characteristics.

For example, Type O personalities are considered well-meaning, but they can also have moments when they turn out to be reckless.

Blood type A personality traits

  • wise
  • lawn
  • sensitive
  • cooperative
  • organized
  • constant
  • creative
  • stubborn
  • deliberately
  • reliable
  • reliable
  • nervous

Blood type B personality traits

  • passionate
  • carefree
  • decisive
  • passionate
  • unstable
  • in hyperfocus
  • collector
  • samolubny
  • uncooperative
  • ambitious
  • sociable
  • happy

AB blood type personality traits

  • popular
  • care
  • reliable
  • reasonable
  • undecided
  • critical
  • homing
  • social
  • He did
  • forgetful

If you have blood type AB, the blood type personality theory suggests that you may have a mix of type A and type B.

Blood type O personality traits

  • convinced
  • intuitively
  • sociable
  • generous
  • Polite
  • optimistic
  • jealous
  • unconscious
  • arrogant
  • unpredictable

In his original work, Furukawa attempted to explain psychological processes through physiological processes.


While there is no definitive proof that your blood type can directly shape your personality, the physical processes in your body can affect your thoughts, feelings, and behaviors.

For example, there may be a chemical imbalancemood swings. Since your mood is often attributed to your personality, it's easy to see how they can be related.

The blood type personality theory may not be backed by scientific research, but it does point out how the body can influence the mind and vice versa.


However, the downside to a theory that has many supporters but no empirical support is that it can often affect people's lives for no reason.

For example, in Japan, the blood type theory of personality is still widely accepted. People can make many important life decisions based on their blood type, including:

  • weddings
  • job and career choice
  • political arrangement
  • social circles and alliances

Furukawa's blood type personality theory even led to a cultural practice in Japan known as "bura-hara," which is discrimination or harassment based on blood type.

The relationship between blood group and health

(Video) 25 EYE OPENING Things Your Blood Type Says About You

While there is currently no scientific evidence to support the idea that your personality can be directly related to your blood type, certain aspects of your physical health may be related to your blood type.

Testsby 2021, suggests that as many as 49 diseases may be affected by blood type - specifically those related to the ABO blood type.

Blood type personality theory, also known as ketsueki-gata, is the belief that a person's personality can be directly influenced by their blood type.

Just as astrology can attribute certain personality traits to movements in the universe, the blood type personality theory attempts to link a person's characteristics to a physiological cause - blood type.

According to this idea, people who share the same blood type can be similar in personality and traits. The theory sees blood types A, B, AB and O as predictors of innate characteristics.

For example, if you're blood type B, you're more likely to have a personality that's a bit more volatile or outgoing.

This theory was introduced by Japanese professor Tokeji Furukawa in 1929, but proved scientifically dubious.

The theory was later revived in the 1970s by Japanese researcher and journalist Masahiko Nomi. Despite this, the blood type theory of personality continues to be the subject of intense scrutiny in the scientific community.

While there is no scientific evidence to support a direct link between blood type and personality, your behavior, mood, and mental health can be influenced by biological processes.

The blood type personality theory may be considered pseudoscience, but that doesn't mean it can't be used as a good conversation starter or for self-discovery.


Can Your Blood Type Affect Your Personality? ›

Currently, no scientific evidence supports a cause-and-effect relationship between a person's blood type and personality

blood type and personality
The blood type personality theory is a pseudoscientific belief prevalent in Japan and South Korea, which states that a person's blood group system is predictive of a person's personality, temperament, and compatibility with others. The theory is generally considered a superstition by the scientific community. › wiki › Blood_type_personality_theory

What does blood type say about personality? ›

Ketsueki-Gata Personalities Associated With Blood Types*
AEarnest, creative, sensible, reserved, patient, and responsible
BPassionate, active nature, creative, and strong
ABCool, controlled, rational, and adaptable
OConfident, self-determined, strong-willed, and intuitive

What is the personality of O+ people? ›

Fun Facts About O+ Blood

– Are usually the “cheerleader” of the group; – Tend to be more followers than leaders, accepting whatever the plan is and going alone with it without protest. – Very generous and kindhearted. – Generally well-liked by most people.

Which is the healthiest blood type? ›

Of the eight main blood types, people with Type O have the lowest risk for heart attacks and blood clots in the legs and lungs. This may be because people with other blood types have higher levels of certain clotting factors, which are proteins that cause blood to coagulate (solidify).

What is the selfish blood type? ›

Type O people have been linked to characteristics such as confidence, determination, resilience, and intuition, but they are also supposedly self-centered and unstable. They are said to especially appear selfish to individuals with Type A blood.

What blood type is cheerful? ›

Blood type O people are cheerful and devoted, value relationship with people.

Why is O positive special? ›

Type O positive blood is critical in trauma care. Those with O positive blood can only receive transfusions from O positive or O negative blood types. Type O positive blood is one of the first to run out during a shortage due to its high demand.

What ethnicity is O positive? ›

African American: 47% O-positive, 24% A-positive, and 18% B-positive. Latin American: 53% O-positive, 29% A-positive, and 9% B-positive. Asian: 39% O-positive, 27% A-positive, and 25% B-positive. Caucasian: 37% O-positive, 33% A-positive, and 9% B-positive.

Which blood type has the strongest immune system? ›

Blood group AB has the strongest contact to pathogen and is the least protected group with respect to innate ABO(H) immunity.

What blood type lives the longest? ›

The blood type B was statistically more frequent among the centenarians than in the control subjects (29.4% vs 21.9%; P = . 04). From these findings, the authors concluded that blood group B might be associated with exceptional longevity.

Which blood type protects you from COVID? ›

Taken together, the authors concluded that type O and Rh-negative blood groups may be protective against SARS-CoV-2 infection and illness.

What blood type is linked to Covid 19? ›

Dana Devine, shows that people with blood groups A or AB are more likely to have a severe COVID infection than people with blood groups B or O. The study looked at 95 patients critically ill with the SARS-CoV-2 virus in the intensive care units (ICUs) of two major Vancouver hospitals.

What type is royal blood? ›

The term “blue blood” has been used since 1811 to describe royal families and the nobility.

What blood type is most needed? ›

Types O negative and O positive are in high demand. Only 7% of the population are O negative. However, the need for O negative blood is the highest because it is used most often during emergencies. The need for O+ is high because it is the most frequently occurring blood type (37% of the population).

What foods should O positive blood types avoid? ›

What foods to avoid with blood type O
  • wheat.
  • corn.
  • legumes.
  • kidney beans.
  • dairy.
  • caffeine and alcohol.

What is the unhealthiest blood type? ›

According to the American Heart Association, A, B, and AB blood types are associated with a greater risk of heart attack due to coronary artery disease than type O blood. In particular, people with AB blood appear to have the highest risk.

Which blood type is stubborn? ›

According to those who believe this theory, these are the personality traits associated with the A+ blood type: tense. stubborn.

What blood type is calm? ›

They say people with type A blood are calm and collected, artistic, and polite; people with type B blood are practical, goal-oriented, and strong-willed; people with type O blood are outgoing, energetic, and outspoken; and people with type AB blood tend to have characteristics on both sides of the spectrum.

What blood type is most loyal? ›

As friends, people with type A are considered very reliable and trustworthy. If you are in trouble, you can rely on friends with this blood type. They may not like to show their emotions; they keep their thoughts or feelings about things hidden from others, and they only show vulnerability when comfortable.

Do siblings have the same blood type? ›

Brothers and sisters don't always share the same blood type. The genotype of both parents plays a role in defining the blood type. For instance, children of parents with the genotypes AO and BO may have the blood types A, B, AB, or O. Thus, siblings do not necessarily have the same blood type.

Why is O negative better than O positive? ›

O negative blood is often called the 'universal blood type' because people of any blood type can receive it. This makes it vitally important in an emergency or when a patient's blood type is unknown.

What does being O positive mean? ›

O+ blood has no A or B antigens, and is thus “O” blood. The (+) means that the Rh antigen is present. O+ blood is very important as a (mostly) universal red blood cell type. This blood type can be used in emergency situations such as traumatic bleeding or other types of emergency transfusions.

Why is O+ blood so common? ›

In order to be group O, you need both parent cells to be O. But group O is still more common simply because it is the ancestral form. The A and B mutations appeared in the last 20,000 years and haven't spread through the population yet.

Is O positive blood hereditary? ›

Those with type O blood have inherited the O gene from each parent.

Who has blood type O positive ancestry? ›

Type O is particularly high in frequency among the indigenous populations of Central and South America, where it approaches 100%. It also is relatively high among Australian Aborigines and in Western Europe (especially in populations with Celtic ancestors).

Are most Native Americans blood type O? ›

Abstract. All major ABO blood alleles are found in most populations worldwide, whereas the majority of Native Americans are nearly exclusively in the O group. O allele molecular characterization could aid in elucidating the possible causes of group O predominance in Native American populations.

What blood type has the most allergies? ›

First, in the selected studies, participants with blood group O were more susceptible than those with non-O blood groups to allergic diseases, especially AR and asthma. In contrast, those with non-O blood groups were more susceptible to AD.

Which blood type is more resistant to disease? ›

Carriers of blood group 0 (I) are generally more resistant to diseases, with the exception of H. pylori-associated gastrointestinal diseases. Carriers of «antigenic» blood groups A (II), B (III), AB (IV) are more susceptible to development of infectious, cardiovascular and cancer diseases.

Which blood type is most acidic? ›

People with type O blood are more prone to stomach problems because of the high acidic content in the stomach. So while they can digest protein well, they have to be cautious about consuming too many fats or carbohydrates.

Which blood group has the shortest life expectancy? ›

People whose blood type is A, B or AB have an increased risk of heart disease and shorter life spans than people who have type O blood, according to a new study.

Which blood group has the lowest risk to heart disease? ›

Heart Disease

There's good news for O blood types. Research shows your risk of coronary heart disease tends to be lower. Experts aren't sure why. Some think it might be because other types are more likely to have higher cholesterol and higher amounts of a protein that's linked to clotting.

Which blood cell type has the shortest lifespan? ›

White blood cells are made in the bone marrow. They are stored in your blood and lymph tissues. Because some white blood cells called neutrophils have a short life less than a day, your bone marrow is always making them.

What blood type is universal? ›

What Is A Universal Blood Type? In an emergency situation where a patient's blood type is unknown, type O negative blood is the only blood type that is safe to use. The reason is that it is compatible with all blood types. Type O negative is known as the universal blood type.

Does blood type affect anything? ›

But your blood type can actually put you at a higher risk for conditions such as heart attack and heart disease. This is because of a gene called the ABO gene — a gene that's present in people with A, B, or AB blood types.

What 2 blood types are not compatible for pregnancy? ›

Rh incompatibility occurs when the mother's blood type is Rh negative and her fetus' blood type is Rh positive. Antibodies from an Rh negative mother may enter the blood stream of her unborn Rh positive infant, damaging the red blood cells (RBCs).

Why do some people not get COVID? ›

It's possible that it's not a mutation in one gene, but a combination of mutations in multiple genes, that render a small number of people immune to COVID. Targeting multiple genes without causing any unwanted side-effects can be tricky and would make it much harder to harness this knowledge for anti-COVID drugs.

Is type O blood rare? ›

Contrary to popular belief, O- blood is not the rarest blood type. It is estimated 7 percent of the population has O- blood type while only 1% of the population has AB- blood.

What should I eat for blood type O? ›

Those with type O blood should choose high-protein foods and eat lots of meat, vegetables, fish, and fruit but limit grains, beans, and legumes. To lose weight, seafood, kelp, red meat, broccoli, spinach, and olive oil are best; wheat, corn, and dairy are to be avoided.

What is the legendary blood type? ›

What's the rarest blood type? AB negative is the rarest of the eight main blood types - just 1% of our donors have it. Despite being rare, demand for AB negative blood is low and we don't struggle to find donors with AB negative blood.

What blood type are warriors? ›

In Japan, people with Type O are commonly referred to as warriors because they are said to be self-confident, outgoing, goal-oriented and passionate.

What causes your blood type to change? ›

Usually, you'll have the same blood type all of your life. In rare cases, however, blood types can change. The change usually relates to unique circumstances, such as having a bone marrow transplant or getting certain types of leukemia or infections. Not all of these changes in blood type are permanent.

What is the new blood type discovered? ›

The Basics: Blood Donation

The new blood group is called Er or erantigens. There are five blood types in this group based on genetic variations of what's known as the Piezo1 protein, which is found on the surfaces of red blood cells.

What does your blood type say about you? ›

People with type O blood have the lowest risk of heart disease while people with B and AB have the highest. People with A and AB blood have the highest rates of stomach cancer. People with type A blood can have a harder time than others managing stress because they often produce more of the stress hormone cortisol.

What is the most common blood type by race? ›

Distribution of blood types in the U.S. as of 2021, by ethnicity. The most common blood type among the population in the United States is O-positive. Around 53 percent of the Latino-American population in the U.S. has blood type O-positive, while only around 37 percent of the Caucasian population has this blood type.

Why can't Type O have vinegar? ›

Blood type O: Parsley

Parsley is a great way of soothing the digestive tracts of type Os. This is in stark contrast to seasonings and spices such as vinegar, cinnamon and corn starch, which are all irritants to the type O stomach.

What blood type should not drink coffee? ›

When it comes to drinks, caffeine and alcohol aren't recommended for type O people. Fizzy drinks, tea, coffee and all types of wine, beer and spirits are restricted on this particular blood type diet. According to D'Adamo, people with blood type O should avoid caffeine because it increases their adrenaline levels.

How to gain weight for O positive blood type? ›

Type O. Based on the blood type diet theory, people with type O blood do best with intense physical exercise and animal proteins, while dairy products and grains may cause problems. According to D'Adamo, gluten, lentils, kidney beans, corn, and cabbage can lead to weight gain in people with this blood type.

What blood type suits everyone? ›

O negative blood can be used in transfusions for any blood type. Type O is routinely in short supply and in high demand by hospitals – both because it is the most common blood type and because type O negative blood is the universal blood type needed for emergency transfusions and for immune deficient infants.

What is special about B+ blood type? ›

About 9% of the population have B positive blood. B positive red blood cells can be given to both B positive and AB positive patients. B positive patients can receive blood from B positive, B negative, O positive and O negative donors.

What blood type is compatible with personality? ›

Blood Type Personality Compatibility

B is most compatible with B and AB. O is most compatible with O and AB. AB is most compatible with AB, B, A, and O. While the personable and 'get along with everyone' O's keep the peace and the party going, you'll see they actually get along best with other O's and AB's.

What blood types don't go well together? ›

People with type A blood will react against type B or type AB blood. People with type B blood will react against type A or type AB blood. People with type O blood will react against type A, type B, or type AB blood. People with type AB blood will not react against type A, type B, type AB, or type O blood.

What blood types don t do well with COVID? ›

Using data from NYP/CUIMC, we found moderately increased infection prevalence among non-O blood types and among Rh-positive individuals. Intubation risk was increased among AB and B types, and decreased among A and Rh-negative types.

What is the most unhealthy blood type? ›

According to the American Heart Association, A, B, and AB blood types are associated with a greater risk of heart attack due to coronary artery disease than type O blood. In particular, people with AB blood appear to have the highest risk.

What should blood type B+ avoid? ›

Type B blood: Avoid corn, wheat, buckwheat, lentils, tomatoes, peanuts, and sesame seeds. Chicken is also problematic, D'Adamo says. He encourages eating green vegetables, eggs, certain meats, and low-fat dairy.

What is B+ blood type personality? ›

People with B blood type are thoughtful and empathetic towards others and make good and reliable friends. These people also face a lot of discrimination because of their negative personality traits such as selfishness and being uncooperative at times.

What are the disadvantages of B+ blood type? ›

People with A, B or AB blood may be at greater risk of diabetes than those with type O blood. In one study, people with B+ blood were at 35% increased risk of developing diabetes, followed by AB+ at 26% increased risk, A- at 22%, and A+ at 17%.

What is the hardest blood type to find a match for? ›

What's the rarest blood type? AB negative is the rarest of the eight main blood types - just 1% of our donors have it. Despite being rare, demand for AB negative blood is low and we don't struggle to find donors with AB negative blood.

What blood type is romantic compatibility? ›

Based on these traits, the theory suggests these blood type matches are most likely to result in happy marriage:
  • O Male × A Female.
  • A Male × A Female.
  • O Male × B Female.
  • O Male × O Female.
Jun 28, 2019


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