Is There Science in Eating According to Your Blood Group Diet?


By Cynthia Antwiwaa Tenyi

Since the publication of his book Eat Right for Your Type in 1996; where Dr. Peter D’adamo argued on the blood type diet, the phenomenon has caught up with virtually everyone and has gained a greater currency and has also generated a lot of debate especially within the health circles.

Christiano, (2013) espoused on blood group or type as  one’s unique genetic codethat helps to ensure individuality and how the body may function in aparticular way and situations. It can even be traced from the ancestors’ genetic traits including diet of individuals

The blood type diet seems to explain a relationship between optimal diet and a person’s ABO blood type. Wong (2018) stated that is mainly aimed at weight management, and combating of diseases for better health. Dr, D’Adamo theorizes to the effect that individual are responsive to different kinds of foods depending on their blood type.The case advanced is that each person has a special body chemistry that affect dietary needs.

The principal proponent of the blood type diet, Dr,. Peter D’Adamo outlined four different diets each meant for four blood groups. The Type A is the agrarian one, who should be fed on plant rich diet in the like of a vegetarian.

Then considered type B as nomad as he calls them with blood type B can eat plants, meat (except chickenand pork). And some amount of dairy. They are to avoid wheat, corn, lentil, tomatoes, and a few other foods.

The type AB – The enigma is a mix of types A and B, and should diet in rich seafood, tofu, dairy, beans and grains. But must avoid kidney beans, corn, beef, and chicken.

Type O- the hunter, thus individuals with O type must eat protein diet that are rich in meat, fish, poultry, some foods and vegetables, but cut down on grains , legumes, and dairy.

According to this theory these kinds of diets are very healthy. It is again argued that the diet is established on the principle of human immune response. In this vein the reaction of the immune system against foreign invaders like viruses and bacteria is ensured by the provision of antibodies. If this diet is followed, one’s body will digest food more effectively. The energy level will then be boosted and diseases are also prevented. Much taste for individuals doing this kind of regime is evidently “nailed to the cross”. Dr. D’Adamo recommends the indulgence and the preference in the choice of a specialty and organic product as well as vitamins and herbal supplements forming a greater part of one’s diet in the scheme of the blood type diet.

The principles in following this kind of diet is that, firstly, one has to know his or blood type or group. It is important for one who does not know it to find it out. Then according to the blood type one identifies him or herself with, he is limited to specific food to be consumed. This then means that it takes knowledge of your type to do the kind of shopping and even cooking that an individual will do. The challenge here is the carefulness and or of taking or buying a packaged food. Dietary restriction is very key in this endeavor and food preferences must be the order of the day at all times

Khader, (2018) reiterated that the blood type diet actually slow down aging and that is the effective way for longevity and good health in general. She advanced the argument on the basis that of eight cases studied with two representatives for each type; dietary regimen was arranged and recommended to patientsand the end results after applying the diet regimen, improved the condition of these patients lending credence to the efficacy of this diet.

There are several views against the validity and the scientific basis for this blood type diet. In the article of Cusack, L. De Buck E., Compernolle V., Vandekerckhove (2013) the system of diet dependenton the ABO blood type  and its importance in relation to good health and fighting of diseases has not been previously  verified in scientific literature. Works presented with data on this blood type diet were carefully done by using the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) paradigm. A systematic search conducted in human categorized according to blood type was the design adopted for this proposition for optimal health. However, out of 1415 references tested by the America Society for Nutrition, 16 articles were found and in that only one was considered eligible according to the selection criteria

One problem is that there are hundreds of conflicting recommendations from the diets so arranged to meet the requirement for the blood type diet for effectiveness. This is enough grounds to identify certain weakness in this system.

A seminar held in February, 2001 by the Norwegian Society for Nutrition which was aimed at searching for the truth in the book written by Dr. D’Adamo was proven to establish that fact most of the issues determined in the book as acase for blood type diet were mere imaginations without stronger scientific basis.

In the light of the argument discussed above, I will wish to conclude and put forward my estimation that a well thought out and planned food or diet is really helpful. For instance, the avoidance of a simple carbohydrates and processed food may go a long way to make one lose weight for a possible healthier life. However I think the hypothesis that establishes a correlation between a particular genetic profile and   recommended diet is wrong. Knowing your blood type I think is good though to make certain ‘potential’ and actual recommendation. I think there is no scientific support to this blood type diet.

The author is a level 100 Naturopathic Medical Student at Nyarkotey College of Holistic Medicine, Ashaiman, behind the Municipal Assembly.


D’Adam, P.(1996) Eat Right 4 Your Type. Retrieved from  http//:

Christiana, J.(2013) Blood Types Body Types And You. Siloam Publication, Mary Lake Florida.

Wong, C. (2018) The Blood Type Diet History, Benefits, and Foods to Eat.

Cusack, L. De Buck E., Compernolle V., Vandekerckhove.(2013) Blood Types Lack Supporting Evidence: A Systematic Review. The America Journal of Clinical Nutrition vol. 98, Issue 1, 1 July2013, Pages 99-104

Khader, D, (2018), Case Studies: Blood Type Based Nutrition. The Khader Group, Mount Kisco, NY, USA. Retrived from http//

Watson, S. (2018), Blood Type Diet. Retrieved from http//

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