The Blood Group Diet

General Health

Does your blood group hold the secret to the food types best suited to you in order to keep healthy?


Emily Condon
BSc (Hons) Biological Sciences

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The Blood Type Diet was first introduced by naturopath Peter J. D'Adamo with the premise being that by following a diet suited to your blood type, your body will digest food more efficiently. D’Adamo believes that you can eat and exercise in a way that will help you be the healthiest version of yourself.

Why do we all have different blood types? 

Not everyone’s blood is the same, there are four main blood groups – A, B, AB and O. The genes that you inherit from your parents determines your blood group. What differentiates one blood group is the presence of specific antigens coating red blood cells to help the body identify which cells are yours.

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

Sometimes there is another antigen present on red blood cells - known as the RhD antigen. Each blood group can be either RhD positive or RhD negative, meaning there are eight main blood groups in total.

The Blood Group Diet

Usually, when we talk about diets, they are seen as a one size fits all that everyone should be able to follow. But lately as is the case with exercise and medicine, nutrition advice has been all about getting personal, hence the ever-growing interest surrounding the blood group diet.

Lectins are proteins naturally found in many foods, they can react with our blood and can trigger inflammation. D'Adamo proposes that following a diet suitable to your blood group to avoid harmful lectins can be good for health. Based on Peter J. D'Adamo’s book, the blood group diet advises the following for the different blood groups:

  • Type O blood: A high-protein diet of lean meat, fish, and vegetables, going light on grains, beans, and dairy is recommended. In regard to exercise, type O’s should focus on exercise that works the cardiovascular and muscular-skeletal systems, like running.
  • Type A blood: Those with type A blood are thought to have a sensitive immune system so a vegetarian diet based on fruits and vegetables, beans and legumes, incorporating whole grains is thought to be beneficial. Activities such as yoga and meditation are good for A-types.
  • Type B blood: are advised to avoid corn, wheat, lentils, tomatoes and chicken. Instead of eating green vegetables, eggs, certain meats such as lamb, along with low-fat dairy. B-types respond well to moderate exercise such as swimming, pilates and walking.
  • Type AB blood: are advised to avoid all smoked or cured meats and instead opt for tofu, seafood, dairy, and green vegetables. D’Adamo recommends smaller, more frequent meals for people with this blood type. Combining both calming yoga and more intense exercises like running or biking is thought to be beneficial.

Should I be following the blood group diet?

There are many conflicting views surrounding the blood group diet as there seems to be no substantial scientific evidence to suggest that D’Adamo’s recommendations are 100% accurate. However, many of his suggestions take advantage of some of the most basic healthy eating principles like consistent exercise and the removal of processed foods with all 4 proposed eating plans being based on real, healthy foods - which may explain why those who follow the blood group diet see improvements in their health. If you are interested in finding out the suggested food types for you, the first step is finding out your blood group which can be completed using our easy blood test - order yours today!

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