Blood Type Information & Research Study (10 Questions)

There are four types of blood (blood groups): A, B, AB and O. Your specific blood group is determined by the genes you inherit from your parents.

Each group can be either RhD positive or RhD negative, which means in total there are eight total blood groups. 

Antibodies and Antigens

Blood is made up of red blood cells, white blood cells and platelets in a liquid called plasma. The blood group type is identified by antibodies and antigens in the blood.

Antibodies are proteins found in plasma. They're part of the body's natural defences. They recognise foreign substances, such as germs, and alert the immune system, which destroys them.

Antigens are protein molecules found on the surface of red blood cells.

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The ABO system

There are four main blood types:

  • blood group A : has A antigens on the red blood cells with anti-B antibodies in the plasma
  • blood group B  : has B antigens with anti-A antibodies in the plasma
  • blood group AB  : has both A and B antigens, but no antibodies
  • blood group O  : has no antigens, but both anti-A and anti-B antibodies in the plasma

Receiving blood from the wrong ABO group can be life threatening; If someone with group B blood is given group A blood, their anti-A antibodies will attack the group A cells.

This is why group A blood must never be given to someone who has group B blood and vice versa.

As group O red blood cells don't have any A or B antigens, it can safely be given to any other group.

In most cases, O RhD negative blood (O-) can safely be given to anyone. It's often used in medical emergencies when the blood type isn't immediately known.

It's safe for most recipients because it doesn't have any A, B or RhD antigens on the surface of the cells, and is compatible with every other ABO and RhD blood group.


Pregnant women are always given a blood group test. This is because if the mother is RhD negative but the child has inherited RhD-positive blood from the father, it could cause complications if left untreated. Typically, it is beneficial to procreate with someone who's blood is compatible with yours. 

RhD-negative women of child-bearing age should always only receive RhD-negative blood.

Blood Type Diet Theory - Dr. D'Adamo

The Promise

Could eating a diet based on your blood type -- O, A, B, or AB -- help you trim down and get healthier? That's the idea behind the Blood Type Diet, created by naturopath Peter J. D'Adamo.

D'Adamo claims that the foods you eat react chemically with your blood type. If you follow a diet designed for your blood type, your body will digest food more efficiently. You'll lose weight, have more energy, and help prevent disease.

What You Can Eat

That depends on your blood type. Here's what D'Adamo recommends for each type:

Type A blood: A meat-free diet based on fruits and vegetables, beans and legumes, and whole grains -- ideally, organic and fresh, because D'Adamo says people with type A blood have a sensitive immune system.

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.

Type AB blood: Foods to focus on include tofu, seafood, dairy, and green vegetables. He says people with type AB blood tend to have low stomach acid. Avoid caffeine, alcohol, and smoked or cured meats.

Type O blood: A high-protein diet heavy on lean meat, poultry, fish, and vegetables, and light on grains, beans, and dairy. D'Adamo also recommends various supplements to help with tummy troubles and other issues he says people with type O tend to have.


Blood Type Personality Theory

Type A

Best traits: Earnest, reserved, sensible, patient, responsible and cautious.

Worst traits: Fastidious, over-earnest, obssesive, stubborn.

Type B

Best traits: Passionate, active, creative, animal-loving, flexible, cheerful, friendly and optimistic.

Worst traits: Irresponsible, forgetful, selfish, lazy, impatient, unreliable and "going own way".

Type AB

Best traits: Creative, calm, rational, sociable, intelligent and adaptable.

Worst traits: Critical, indecisive, unforgiving, and aloof.

Type O

Best traits: Confident, self-determined, ambitious, strong-willed, intuitive, agreeable, competitive and athletic.

Worst traits: Unpredictable, spiteful, self-centered, cold, aggressive, arrogant, envious and ruthless.

Evolutionary Origins

I am not going to go too deep on this post about the origins of our blood types, however I will say that there is massive geographic correlation to where our blood type originated on Earth, and even potentially OFF Earth if you have 0- blood. Stay tuned, I will be making a video about this topic shortly! 

Blood Type Survey Research

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Thank you for reading, and a BIG thank you if you've helped in the research by filling out the survey!!

If you are looking to optimize your health or even just learn more about your blood type and how it affects you, leave me a message and I will get in touch with you!

With love, 

Samantha Lotus

Lifestyle Alchemist, Naturopath & Science Nerd