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Is Diet by Blood Type logical?

Ganesh.Dutta's picture

In today’s modern and dynamic world diet is a big issue .Due to increasing health awareness , people are inquisitive about healthy and balanced diet . Keeping this in mind Blood Type Diet was conceived by Peter D'Adamo, which has been given in his book “  Eat Right 4 Your Type” and “Live Right 4 Your Type”, who based it on the premise that blood type has its own unique antigen marker that reacts in a negative way with certain foods. Also, individuals have varying levels of stomach acidity and digestive enzymes, and these traits seem to be correlated with blood type.




Peter D'Adamo recommended various types of diet classified according to the blood group:


1.for Blood Group A: He proclaimed the blood group A as The Cultivator.He believed that they are visionary and analytical. The strength of these people lie in that they adapt easily to dietary and environmental condition .They possess the weakness that they are unable to digest and metabolize meat protein easily .He recommended vegetarian food for those people.


2for Blood Group B: He proclaimed the blood group B as The Nomad .He believed that they are Balanced, flexible, creative. The strength of these people lie in that they have Strong immune system and versatile adaptation to dietary and environmental changes .They possess no natural weaknesses .He recommended dairy products  for those people.


3.for Blood Group AB: He proclaimed the blood group AB as The Enigma.He believed that they are Rare, versatile, compassionate. The strength of these people lie in that they  are designed for modern conditions .They have highly tolerant immune system .They possess the weakness that they have sensitive digestive tract and open to microbial invasion .He recommended vegetarian food and dairy products for those people.


4.for Blood Group O : He proclaimed the blood group A as The Hunter .He believed that they are Strong, self-reliant, leader. The strength of these people lie in that they have strong immune system and Natural defenses against infections. They possess the weakness that they are intolerant to new dietary and environmental conditions. He recommended meat-rich diet along the lines of the Paleolithic diet for those people.



This dietary suggestion seem to be very simple but the fact is that it is not  a such simple one .I am a foodie and I believe that our taste ,climatic conditions ,culture and food availability provide a guideline for the diet and it is generally seen that people abide by it. People in colder latitudes generally opt for high energy reach diet of meat  to meet the demand of higher energy by their body. Some people due to their religious belief do not consume meat though having the blood group O. Jains and Buddhist are the most common example.

D'Adamo's Blood type diet has met with others many criticisms. The fundamental criticisms are first, that none of his hundreds of citations to others' research on blood groups directly support his claims of differential food tolerances, and second, that he provides no comparative clinical trials demonstrating efficacy of his diet.

One criticism of D'Adamo's hypotheses and recommendations claims that he provided inadequate evidence. For example, his first book, Eat Right 4 Your Type, published in 1997, contains only a bibliography. Most of his subsequent books, however, have been thoroughly referenced as far as his general theory. However, the reasons  for the classifications of the foods in his diet remains undocumented.

Overall the Blood type diet is a very innovative diet plan .The interesting fact is that those people of blood group ‘O’ who prefer non –vegetarian diet ,now have a reason to do so and also the people of Blood Group ‘A’ who want to restrain from non-vegetarian diet have now a solid foundation to restrain from it.


- Retrieved on August 18, 2006. Frequently asserted objections. Accessed August 18, 2006

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The.Tortilla.Guy's picture
Great Blog !! are you a Doctor ? The Tortilla Guy
Ganesh.Dutta's picture
Hey steve, I am not a doctor .I am foodie,foodie and foodie only......................
shantihhh's picture
Ganesh the Blood type diet has always been facinating, just like the Blood Type and Personality that the Japanese believe quite strongly! They believe a person's ABO blood type or ketsueki-gata (血液型, ketsueki-gata?) is predictive of their personality, temperament, and compatibility with others, similar to the Western world's astrology. This belief has carried over to some extent in other parts of East Asia such as South Korea and Taiwan. This theory is completely dismissed by many scientists as superstition or pseudoscience. We have had many Japanese student live with us on home-stay programs while learning English over the span of 20 years. I must say they often bring the subject up for discussion especially if there were two students who did not get along. Immediately one would refer to the other's blood type. The blood type diet is an American system whereby people seek improved health by modifying their food intake and lifestyle according to their ABO blood group and secretor status. This system includes some reference to differences in personality, but not to the extent of the Japanese theory. I find it all interesting as our entire family have the same blood type which is more typical in Asians. We all are b+ Shanti/Mary-Anne
shantihhh's picture
Interesting read on this subject i.e. rebuttal to the Dr. Peter D'Adamo thoughts on this. Fortunately it doesn't matter as type B is to eat a balanced diet and I do! Shanti/Mary-Anne
Ganesh.Dutta's picture
yes mary-anne, you are absolutely right.infact Blood type theory is widely popular in women's magazines as a way to gauge relationship compatibility with a potential or current partner. Morning television shows feature blood type horoscopes, and similar horoscopes are published daily in newspapers. Though there is not a proven correlation between blood type and personality, it has still remained in the many matchmaking services that cater to blood type. In this way, it is similar to the use of astrological signs in the west, which is also popular in Japan. Asking about a blood type is common and it is often a surprise if a foreigner is unaware of their own blood type.
Snigdha's picture
In Japan, a superstition similar to horoscopes, but based on blood type is very common. People believe that the blood type influences one's personality, weaknesses and strengths. A list of traits ascribed to the various blood types: * Type A: calm, composed, serious, reliable, perfectionist, arrogant, suppress their emotions * Type B: curious, bright, cheerful, enthusiastic, superficial, unreliable, selfish * Type 0: carefree, generous, independant, flexible, clumsy, flighty * Type AB: sensitive, considerate, careful, efficient, strict, moody Almost every Japanese person knows their blood type due to physical examinations in school, and while even those who believe in it (mostly teenage girls) don't take it very seriously, the superstition is everywhere: people use it as a conversation starter and especially to determine compatibility of lovers and friends. The belief was started in 1927 by Takeji Furukawa in a series of articles and books. Even though he had no credentials in the field and scientists objected strongly to it, the media and public gobbled it up. Follow-up studies linked blood type to disposition towards academic success or different types of crime. Interest in this lore tapered off after Furukawa's death in 1940, but it was revived in 1970 by journalist Masahiko Nomi by a series of books that sold millions of copies, and that new popularity has lasted until today. Source:
Snigdha's picture
Very Interesting Blog Ganesh. It has encouraged me to google and learn more about blood-type compatibility;)
Ganesh.Dutta's picture
thanks snigdha!
nehapaul's picture
interesting posting.........................
shantihhh's picture
Dr. Foodie aka Ganesh Fun subject. There is also a popular in the US numbers astrology. I have had readings done in India where they use your birthdate, time, and exact location. There is one 'see-er" in Jaipur or was it Jodphur that gave my "sister" Anu a reading about her daughter getting married. It all ame true! He also told me things that really were a surprise as a French reader in Paris had told me the same thing, as did a Russian palm reader years before. All was true. It is very interesting these horoscope things. The blood type thing I don't know if there is really a truth to it as my husband, our children, my mother, my father we all are type B+ and all have very different personalities. ind the following uite interestingandthesite has much more. Evolution of Blood Types Back in the early days of man, there were only blood type O people. This means the surface of the red blood cells had neither A nor B antigens on it. This has carried down until today, when the vast majority of people are still type O. Around 20,000BC, a mutation occurred, and some people began to be Blood Type A. These people developed an A membrane or antigen on the surface of their blood cells. This blood type became common in central Europe as well as Scandanavia. Many feel this change occurred when farming became common in those areas. The next change was around 10,000BC. This is when some people developed a Type B membrane on their blood cells. This change took place in Asia and Japan, and biologists are not sure what encouraged this change to take place. It was not until around the 1500s that the A groups and B groups began to mix as travel became more and more common. This formed the AB blood type, which is most common now in northern India, even though it is still the rarest of the four main blood types. Only 5% of US residents are blood type AB. Since the different blood types really only matter when you have a blood transfusion, it is only in the past few hundred years that having different types of blood mattered at all - and it was only in 1909 that doctors finally figured out what caused some blood transfusions to work and others to fail! Shanti/Mary-Anne
Ganesh.Dutta's picture
thanks a lot for nice compliment and sharing your mind warming idea!
Ganesh.Dutta's picture
Hey Mary-anne, But It is true that Indian and Western astrology share a common ancestry as horoscopic systems of astrology, in that both traditions focus on the casting of an astrological chart or horoscope, a representation of celestial entities, for an event based on the position of the Sun, Moon, and planets at the moment of the event. However, Indian astrology uses the sidereal zodiac, linking the signs of the zodiac to their original constellations, while Western astrology uses the tropical zodiac. Because of the precession of the equinoxes, over the centuries the twelve zodiacal signs in Western astrology no longer correspond to the same part of the sky as their original constellations. In effect, in Western astrology the link between sign and constellation has been broken, whereas in Indian astrology it remains of paramount importance. Other differences between the two traditions include the Indian use of 27 (or 28) nakshatras or lunar mansions, which have been used in Indian astrology since Vedic times, and the system of planetary periods known as dashas. In Chinese astrology a quite different tradition has evolved. By contrast to Western and Indian astrology, the twelve signs of the zodiac do not divide the sky, but rather the celestial equator. The Chinese evolved a system where each sign corresponds to one of twelve 'double-hours' that govern the day, and to one of the twelve months. Each sign of the zodiac governs a different year, and combines with a system based on the five elements of Chinese cosmology to give a 60 (12 x 5) year cycle. The term Chinese astrology is used here for convenience, but it must be recognised that versions of the same tradition exist in Japan, Vietnam, Thailand and other Asian countries. In modern times, these traditions have come into greater contact with each other, notably with Indian and Chinese astrology having spread to the West, while awareness of Western astrology is still fairly limited in Asia. Astrology in the Western world has diversified greatly in modern times. New movements have appeared, which have jettisoned much of traditional astrology to concentrate on different approaches, such as a greater emphasis on midpoints, or a more psychological approach. Some recent Western developments include: Modern tropical and sidereal horoscopic astrology Cosmobiology Psychological astrology Sun sign astrology Hamburg School of Astrology Uranian astrology, subset of the Hamburg School
shantihhh's picture
Dr. Foodie This is very interesting to me! I was captivated and am by Indian astrology, it quite accurate indeed. Shanti/Mary-Anne
Is Diet By Blood Type Logical?