Blood Type Diet: The Genetic Fingerprint

The Science of Blood Type

The Science of Blood Type has been evolving ever since the beginning of  known human history. It is the science of individuality – an acknowledgment that each of us has a genetic fingerprint located in the cells of our bodies.

First of all, you need to understand the reason why your blood type can make such a crucial difference in how you live and what you eat. Blood type is not a neutral factor. Rather, it behaves as the control valve of your immune and digestive systems, a biological watchdog that enhances your body’s ability to survive and thrive.

In his great first book, Eat Right 4 Your Type,  Dr.Peter D’adamo fully explains the mechanism by which your blood type responds to the food you eat – either for good or for ill. It details the scientific and anthropological reasons for the four distinct blood type. The following is a brief summary of that information.

The Key to Survival

Almost everyone, including doctors, considers the importance of blood type only in relation to transfusions. The gross limitations imposed by such a narrow view become readily apparent when you consider the central role blood type has played in the survival of  the human race. Consider this: were it not for the unique adaptations that have taken place within the blood, the human race would not have been able to survive.

Each of the blood types evolved in response to both the physiological development of the species and changing climate conditions over the aeons since humankind first trod the Earth. This is the vital clue to the importance of blood type. The adaptations that occurred in the course of evolution not only strengthened our immune systems against new bacterial, viral and environmental assailants, but at the same time permitted our vurnerable digestive systems to adapt to a wide range of unfamiliar foods.

The Blood Type – Diet Connection

How does the composition of the sugars that make up the blood types relate to what you eat? A chemical reaction occurs between your blood and the food you consume. We know this because of a factor called lectins. Lectins are abundant and diverse proteins found in food. They are agglutinating – gluing or sticking – properties that affect your blood. When you eat a food containing protein lectins that are incompatible with your blood type antigen, the lectins target an organ and begin to agglutinate blood cells in that area. In effect, lectins gum up the works, interfering with digestion, insulin production, food metabolism, and hormonal balance.


Many people never heard about lectins before and some were sceptical. In fact, hundreds of papers have been written about the effect of lectins. The fact that they haven’t had wider public exposure relegates lectins to the province of a well-kept secret. Apparently, Eat Right 4 Your Type was the first time that the results of the extensive scientific research had ever appeared in a mainstream publication.

Knowing about the potential danger of lectins does not mean that you should suddenly become fearful of every food you eat! After all, lectins are widely abundant and hard to avoid. The key is to avoid the lectins that agglutinate your blood type. For example, gluten, the most common lectin found in wheat, has a shape different from the lectin found in soya, and it attaches to a different combination of sugars. Gluten binds to the lining of the small intestine and cause substansial inflammation and painful irritation in some blood types, particularly Type O. Chicken, on the other hand, which is fine for Type Os  and Type As, contains a lectin in its muscle tissue that agglutinates Type B and Type AB blood cells.

What This Means for You?

Here’s the bottom line:  we are predisposed to certain strength and weaknesses according to our blood types. We can maximize our strengths and minimize our weaknesses by knowing what our bodies need and by feeding ourselves and our families accordingly.

The crux of Blood Type Diet is the fact that certain foods complement certain blood types. Other foods antagonize and debilitate particular blood types. By stressing complementary foods and eliminating clearly antagonistic foods, you can promote the best possible balance for your immune and digestive systems. Most of your compatible foods correspond to your  blood type’s evolutionary development. In other words, the foods that fit your blood type are often the very foods that were predominant at the time in history when your blood type first appeared. For example:

If you are Type O, you respond best to a high- protein diet, including meat, poultry, fish and variety of fruits  and vegetables. Many grains, legumes, and dairy products are incompatible with your blood type.

If you are Type A, you thrive on primarily vegetarian diet, including soya products, beans and legumes, grains, vegetables, and fruits, with small portions of fish.

If you are Type B, your optimal diet includes game meat like rabbit and venison as well as herd meats, such as lamb and mutton. However, Type B should avoid chicken. Unlike Type O and Type A, Type B benefits from a variety of dairy products. Some grains, beans and legumes cause problems for type B, but there is a wide selection of vegetables and fruits available. In almost every respect, the Type B Diet is the most varied.

If you are Type AB, your diet is more complex – a combination of Type A and Type B. Type AB can eat most of the foods that are good for these blood types, but must avoid or limit most of the foods that agglutinate them. The best diet for Type AB consists primarily of vegetarian fare, with modest supplements of meat and dairy.

To help you eat right for your blood type, refer to detailed food charts and information for Type O, Type A, Type B, and Type AB in That means emphasizing the foods you find on the Highly Beneficial lists, restricting the foods you should Avoid, and incorporating the wide range of Neutral foods in a balanced and healthy way. As I and  many people around the world  have discovered, eating right for your blood type can produce extraordinary and almost immediate results in combating allergies or other chronic conditions. Following your Blood Type Diet can also result in immediate changes such as:

  • Weight lost
  • Restoration of normal insulin production
  • Cessation of troublesome digestive problem
  • An increase in energy and stamina

The long-term benefits are even meaningful. The Blood Type Diet can help you:

  • Combat serious illness, such as cancer and cardiovascular disease
  • Avoid common viruses and infections
  • Eliminate the toxins and fats that contribute to obesity, and
  • Slow the process of cell deterioration that accompanies ageing
  • Pass out kidney stones of your body in  natural way (as in my case)

And the best news of all is that you can achieve all these benefits while enjoying a healthy, satisfying, and varied diet. Good living  and good health are yours to enjoy.


  1. “Cook Right 4 Your Type”, Dr. Peter J. D’adamo & C. Whitney, Century, 2001