Blood type eating – briefly
This article refers to two books:
- “Eat Right 4 Your Type“, by Dr. Peter D’Adamo ND, published in 1996 and updated in 2016, and
- “Dr. Mozzi’s diet. Blood types and food combinations“, Dr. Piero Mozzi, translated from Italian in 2017.
Your blood type is genetic, but your genes are not your fate. In other words, you are not a victim of your genes.
Blood type eating only looks at the ABO blood type (O, A, B, or AB). It does not look at the Rhesus factor (positive or negative). If you do not know your blood type, ask your doctor. If you donate blood, they will tell you your blood type. In some countries, such as Spain, pharmacies are permitted to test you and to tell you your blood type immediately. In Belgium, you require a written order from a doctor to find out your blood type. The most common blood types are A and O. More precise blood typing systems are known (for organ transplantations), but ABO blood typing is the most widely known. Public health authorities have been collecting blood type statistics for more than one hundred years.
If you have little time or interest to read the science, if you know your blood type, then start with Dr. Adamo’s Getting Started Guide.
Who you are
Your blood type is part of who you are, your biological identity. It comes from your parents and their parents and so on. If you do not know your blood type, you do not know who you are. Your blood type is not only genetic, but also metabolic. In other words, it affects your digestion. The ideas and methods of Drs. D’Adamo and Mozzi are summarized here:
- There is no one optimal set of healthy eating habits for everybody. Specifically, veganism can be healthy, even therapeutic, for some people, but it can be unhealthy for others. Similarly, eating good-quality red meat can be healthy for some people in moderation, but slightly poisonous for others. The same dichotomy applies to coffee, carbonated water, bananas, blackberries, leek, sweet potatoes, lentils, soy, echinacea, peanuts, and others. What is healthy for you may not be healthy for me and vice versa. This can be difficult for many people to accept. All anyone really knows is their own digestion. Many people assume that what is healthy for them is also healthy for everybody, since we are all human. Yes, we are all human, but we are not the same. We are each biochemically individual. In brief, the body is a garden, but your garden is not my garden.
- Your blood type affects your digestion (your metabolism), such as the natural acidity of your stomach at rest, the secretion of your digestive enzymes, and possibly your iron balance.
- Depending on your blood type, certain foods are either healthy, neutral, or unhealthy for you. Healthy foods keep your blood thin, while unhealthy foods make your blood coagulate very slightly. The details have to do with a selective reaction between the blood and lectins in the food, depending on your specific blood type and on the specific food.
Soul food for you
Everybody wants to be healthy. Your spirit has a life force, a vital energy, that wants your body to be healthy. Most of all, this primal urge depends on being free of what makes you unhealthy, including foods that interfere with your digestion and do not nourish you. The main idea is to improve digestion, which results in healthy weight and longevity. Good health depends on optimal digestion. What is optimal digestion? It begins with an absence of constipation, bloating, diarrhea, stomach pains, and excess gas. It continues with absorption and assimilation of the nutrients from your food into your blood, tissues, organs, and bones. Good digestion ends literally and figuratively with the regular, healthy excretion of waste and toxins. One to three bowel movements a day are typical of a healthy digestion. Good digestion leads to a healthy weight and healthy ageing. What matters more to you – your health or your habits?
Try it and see
Why not try blood type eating for one to three weeks, and then see how you feel? Write a meal plan, and keep to it. You have nothing to lose. Note that there is no restriction on portion size. It is not necessary to count calories. Of course, it is better not to overdo it and to eat in moderation, but eat as much as you want. Simply keep in mind that, even in moderation, foods to be avoided are to be excluded completely. In other words, according to this method and for optimal results, there is no moderate quantity of foods to be avoided.
Can be cheap and tasty
By the way, it may cost you more than donuts, corn flakes, frozen pizza, and soda, but it will probably not cost you much more. It may even cost you less than what you are paying for your current eating habits, including the price of ill health. If you use herbs and spices, you can make your meals taste delicious. It simply takes some time in the kitchen, for example to make smoothies, to steam vegetables, to boil eggs, to cook omelets, to sautee beef, turkey, or fish, or to prepare vegan meals of grains, beans, or legumes.
Recipes are to be included on this site, according to blood type eating and noting the specific blood type. Some foods are even beneficial or neutral for all blood types, such as lemon, apples, pears, dates, plums, grapes, spinach, broccoli, carrots, cod, sardines, salmon, almonds, walnuts, and ginger. Dr. Peter D’Adamo’s book, “Eat Right 4 Your Type“, has the complete details by blood type of foods that are beneficial, neutral, and to be avoided (potentially inflammatory). He includes recipes for each blood type. A multi-lingual reference (also for translation) of foods by blood type is bloodtypefood.com.
Blood type eating – in detail
Dr. Peter D’Adamo continued the research of his father, Dr. James D’Adamo, also a naturopathic physician. The father worked in mountain health spas in Germany and Switzerland in the 1960s. People went to these spas to recover from surgery and for their health. They enjoyed clean mountain air and were served fresh vegetarian food. The father clearly observed that some people recovered their health, while others did not. When he went to his files, he found that most of those who did not recover their health had blood type O. He later observed that the people with blood type O tended to recover their health after starting to eat eggs or meat again.
How to try this
You may already avoid certain foods. If so, you could still possibly use this method to avoid or substitute other foods for one to three weeks, and then see how feel. On the other hand, you may have eaten the same food since your childhood. It may remind you of happy childhood moments. It may remind you of your sense of national or other identity. If blood type eating excludes these foods for your blood type, you might try cutting these foods one-by-one, such as wheat or dairy, for a week, and then see how you feel. What matters more to you – your health or your habits?
You might also consider cutting one food at a time, for one to three weeks, and then eating it again. If it makes you sick (your digestion), then you know that this food is not healthy for you, even if it reminds you of a happy childhood or your origin. Do your own experiment. You have nothing to lose, and you are the only one who can evaluate and improve the health of your digestion. Health begins in the gut.
Blood type eating table
According to blood type eating and the latest edition of “Eat Right 4 Your Type“, the following table lists the:
- four blood types – O, A, B, AB – and their typical proportions of the population in most places on earth,
- most common foods that are beneficial, and
- most common foods that are to be avoided.
|Blood type||Healthy (beneficial)||To be avoided|
|carbonated water, green tea, banana, plums, fig, mango, blueberries, cherries, pineapple, broccoli, spinach, onion, parsley, garlic, parsnips, pumpkin, turnips, artichoke, kale, horseradish, sweet potato, adzuki beans, beef, lamb, veal, sardine, herring, mackerel, cod, salmon, pumpkin seeds, walnuts, flaxseed, hemp seeds, olive oil, seaweed, ginger, cayenne (chili pepper), dandelion, peppermint, curcuma, carob, fenugreek, …||coffee, decaffeinated coffee, black tea, chamomille, distilled liquor, avocado, cantaloupe, honeydew melon, tangerine, kiwi, orange, plantain, blackberries, coconut, aloe vera, cauliflower, cucumber, leek, mushrooms (white and shitake), potato, corn, alfalfa sprouts, eggplant, rhubarb, black olives, pickles, lentils, wheat, most beans except adzuki, cow’s dairy, ham, bacon, pork, smoked salmon, peanuts, cashews, pistachio, poppy seeds, sunflower seeds, Brazil nuts, corn oil, ketchup, mustard, black (and white) pepper, pickles, echinacea, St. John’s wort, …|
|coffee, red wine, green tea, chamomille, soy milk, lemon, lime, grapefruit, plums, apricot, figs, pineapple, blackberries, blueberries, cherries, carrot, broccoli, celery, spinach, parsley, horseradish, kale, squash (courgette), parsnips, turnips, alfalfa, aloe, leek, buckwheat, oats, tofu (fermented soybean), amaranth, lentils, black beans, green beans, adzuki beans, natto, tempeh, miso, cod, salmon, sardine, tilapia, pumpkin seeds, peanuts, flaxseeds, walnuts, garlic, ginger, cinnamon, parsley, curcuma, fennel, blackstrap molasses, St. John’s wort, echinacea, fenugreek, hawthorn, valerian, …||black tea, orange juice, coco milk, beer, carbonated water, distilled alcohol, orange, banana, plantain, mango, tangerine, papaya, coconut, potato, sweet potato, cabbage, tomato, eggplant, olives, chili (cayenne), lima beans, wheat, ketchup, mayonnaise, pickles, chickpeas (garbanzo beans), red beans, white beans, Brazil nuts, pistachio nuts, cashews, corn oil, coconut oil, margarine, palm oil, cow’s dairy, oysters, caviar, beef, lamb, veal, liver, pork, bacon, ham, rabbit, duck, chili, pepper (black, white, and chili), gelatin, aspartame, vinegar (all), …|
|water, green tea, sage tea, licorice tea, aloe vera, banana, cranberry, watermelon, grape, plum, papaya, pineapple, broccoli, carrot, beet, cabbage, kale, sweet potato, Brussels sprouts, parsnips, cauliflower, parsley, eggplant, oats, spelt, millet, brown rice, puffed rice, barley, red beans, lima beans, cottage cheese, feta cheese, goat cheese, mozzarella, natural whole yogurt, kefir, turkey, lamb, rabbit, cod, sardine, mackerel, salmon, walnuts, olive oil, ginger, cayenne, horseradish, blackstrap molasses, ginseng, licorice, …||carbonated water, distilled liquor, coco milk, soy milk, avocado, blueberry, pomegranate, coconut, aloe vera, artichoke, corn, pumpkin, green and black olives, radish, rhubarb, tomato, amaranth, wheat, couscous, kamut, buckwheat, chickpeas, rye, rice, soy, miso, natto, lentils, adzuki beans, chicken, duck, ham, pork, bacon, pumpkin seeds, peanuts, sesame seeds, tahini, pistachio nuts, sunflower seeds, pistachio, ketchup, green and black olives, blue cheese, ice cream, mussels, eel, crab, trout, smoked salmon, frog, escargot, lobster, white pepper, stevia, cinnamon, …|
|green tea, chamomille, ginseng tea, lemons, grapefruit, watermelon, pineapples, grapes, figs, cranberry, alfalfa, kiwi, beets, broccoli, kale, parsnips, turnips, sweet potato, parsley, celery, cucumber, cauliflower, cucumber, oats, millet, brown rice, rye, spelt, tofu (fermented soy), soy flour, green lentils, white beans, tofu, miso, natto, tempeh, eggs, cottage cheese, feta cheese, goat cheese, mozzarrella, ricotta, yogurt, cod, sardines, mackerel, salmon, olive oil, peanuts, walnuts, peanuts, sardine, cod, turkey, garlic, ginger, oregano, parsley, horseradish, miso, dandelion hawthorn, milk thistle, licorice, echinacea, blackstrap molasses, …||coffee, black tea, orange juice, distilled alcohol, banana, orange, mango, avocado, blueberry, pomegranate, coconut, aloe vera, artichoke, corn, shitake, radish, rhubarb, black olives, (chili pepper), buckwheat, chickpeas, kamut, red beans, black beans, lima beans, adzuki beans, brie cheese, camembert, parmesan, provolone, cow’s milk, ice cream, smoked salmon, trout, crab, frog, lobster, oyster, chicken, beef, pork, bacon, veal, pumpkin seeds, sesame seeds, tahini, sunflower seeds, poppy seeds, ketchup, pickles, gelatin, mustard (with wheat and vinegar), soy sauce, carob, vinegar (all), butter, black pepper, cayenne/red pepper, …|
Nota bene. Some foods are beneficial for all blood types, such as broccoli. The above table is not complete. It is merely part of the detailed blood type eating method. Some less common foods are not included. Many foods are neutral by blood type, in other words part of healthy blood type eating. Neutral foods are not listed here. Some neutral foods may be very healthy for you because of their mineral or vitamin content. You are biochemically individual, so you may find that your digestion can tolerate small quantities of a food to be avoided or cannot tolerate food thought to be beneficial. If you have accumulated environmental toxins or inflammation in your whole body over your lifetime, then you may find that you have reactions to certain foods independently of your blood type. For a complete list of foods by blood type, read the book, or else read Dr. D’Adamo’s blood type eating website. To get started with blood type eating, click on the guide to getting started with blood type eating from his website.
Does not work for everybody
Many people report that this method works for them, but it does not work for everybody. To test it thoroughly, try it for at least a week, possibly for three weeks, eating only healthy (beneficial) or neutral foods and excluding completely foods to be avoided for your blood type. Another way to experiment is to cut a certain food for at least a week, possibly three weeks, and then try it again in a mono-meal a week later. Then see how you feel. Listen to your body. Your body and your digestive system will send you messages. Again, what matters more to you – your health or your habits?
To look for a specific food not in the above table and whether it is healthy for your blood type or not, at least according to blood type eating and Dr. D’Adamo, first know or find out your own blood type and then:
- Click on search for a specific food, D’Adamo’s TypeBase V program online,
- Enter part of the name of the specific food, and then select from the list,
- Notice the row of boxes with blood types – A B AB O – and the possible colors. Green means beneficial. Light yellow is neutral. Light orange is avoid. Light grey is unknown.
What do you value more – your health or your habits?
If any of your favorite foods are on the list of foods to be avoided by your blood type, you might still try cutting them for at least a week, and then see how you feel. If it works for you, you will probably continue, if you value your health. What do you value more – your health or your habits? To try blood type eating, you simply do not eat what is to be avoided. You eat only what is beneficial or neutral. This does restrict choices, but the list includes many foods for each blood type. Again, the above table is incomplete. Complete details are in the book and on the website. If you know your own blood type, you could start with Dr. D’Adamo’s Getting Started Guide.
Why does this work?
It works, because it keeps your blood thin, naturally, gently, without aspirin. Specifically, there is a selective reaction between the lectins in your food and the antigens in your blood, depending on the specific food and on your specific blood type. This reaction either slightly thins the blood, slightly coagulates the blood, or has no effect on blood viscosity. For a list of approximate blood type distribution in Europe, click on European blood type distribution by country.
What are blood types?
How do we know about blood types? In hospitals at the end of 19th century, they were killing people with botched blood transfusions. In 1901, Dr. Karl Landsteiner, a physician in Vienna, Austria, took blood samples from the staff in his lab. He mixed them and observed that some combinations coagulated slightly (agglutinated or formed clumps) and some did not. Dr. Landsteiner’s discovery led to the ABO blood type system – and the possibility to transfuse blood without killing people. Other more precise blood typing systems are known, for example to predict compatibility of transplanted organs.
Independently, in the 1940s, Dr. William C. Boyd at Boston University and Dr. Karl O. Renkonen at the University of Helsinki, Finland, discovered the human blood type specificity of lectins (hemagglutinins). They found that crude extracts of the lima bean (Phaseolus limensis) agglutinated blood type A red blood cells but not blood type B or O cells, while extracts of the asparagus pea (Lotus tetragonolobus) agglutinated blood type O red blood cells specifically.
Blood type antigens
Technically, the molecule which determines your blood type is an antigen. If provoked, an antigen can stimulate the production of an antibody (an immune response). Antigens are also found in bacteria, fungi, and the cells of transplanted organs. Your blood type antigen is a sugar molecule found on the surface of your red blood cells. Outside of you, if someone receives your donated blood, it is treated as ‘other’ by a person of another blood type, who may carry an antibody against it. The particular antigens that identify blood type A, B, AB or O are not limited to humans nor limited to blood. These antigens are also found on the tongue, lungs, stomach lining, intestines, pancreas, liver, ovary, prostate, in secretions, and in other animals.
What are lectins?
Lectins are proteins found in many foods. During and after digestion and absorption, specific lectins react with the blood and with the digestive system. This reaction causes the blood to agglutinate (thicken) slightly, or to become slightly thinner, or to stay constant in viscosity, depending on the specific food and the specific blood type. A slight thickening can inflame the digestive system. So certain foods for certain blood types are beneficial, to be avoided, or neutral, based on many observations of this reaction, according to doctors who have studied this. Individual results may vary slightly. This four-minute video describes lectins briefly.
By the way, D’Adamo also describes what he calls the “secretor” status, which depends on whether the specific blood type proteins are found only in the blood or also in secretions of the body. He offers a proprietary test of the secretor status. I did not test myself for this. Blood type eating is possible without the detail of the secretor status. He says that eighty percent or more of people are secretors. D’Adamo also sells supplements, but you are not obliged to buy food supplements to try out this idea. I do not buy nor recommend supplements.
ABO to go
The medical authorities have kept statistical totals of blood types for a hundred years, since Dr. Landsteiner found the blood type. The statistical distribution of blood types varies slightly from one country or region to another. In total, in most countries and regions on earth, blood type O typically composes between thirty-five and fifty percent of the population. Blood type A composes between thirty-five to fifty percent of the population. Blood type B composes between ten to twenty percent of the population. Blood type AB composes between three to eight percent of the population. Blood type B recipes tend to be similar to blood type O recipes, with some exceptions, while AB recipes tend to be similar to A recipes, also with some exceptions.
Even Dr. D’Adamo himself acknowledges that this method does not work for everybody. He reports that of the people who have read his book and written to him, eighty percent are either satisfied or very satisfied, as if to say that twenty percent were not satisfied. Of course, this is merely an anecdote. His book is not a holy book to me. I do not believe it completely myself. For example, he says that for my blood type (O), coconut oil and apple cider vinegar are to be avoided, but they do not seem to me to undermine my digestion. I often use coconut oil to cook omlets and to sauté turkey and beef. D’Adamo recommends pecorino (sheep) cheese for blood type O, but I find that it does not agree with my digestion. Nevertheless, the idea of blood type eating is food for thought, and many people report that it works for them. It has also been independently confirmed by Dr. Pierro Mozzi, an Italian medical doctor.
Try it yourself and see
Again, a true test of blood type eating would exclude all foods to be avoided and include only beneficial or neutral foods. It works for me, and I only follow it ninety percent. On a popular online bookseller, D’Adamo’s book has received almost two thousand reviews. More than eighty percent of these reviews are four- or five-star. This proves nothing, of course, but this is a lot of online book reviews. At conferences, I have also heard naturopathic physicians recommend this method and report that it works for their patients.
Other patterns by blood type
Dr. D’Adamo’s father observed other patterns of anatomical and physiological differences by blood type. For example, certain types of exercise and certain nutrients tend to be more desirable for certain blood types than for others. The following table lists the blood types, anatomical and physiological patterns, desirable exercise, and desirable nutrients and what foods contain them, according to Dr. D’Adamo and his father. If you have a medical condition, see a doctor.
Nota bene. These are merely suggestions and observations of patterns by the Drs. D’Adamo. You may be an exception. You may not be an exception. There is some research about the statistical susceptibility of one or another blood type to certain diseases. Blood type has a metabolic significance. If you have a medical condition, see a doctor. These data are from Drs. D’Adamo:
|Blood type||Patterns of anatomy and physiology||Recommended exercise||Desirable nutrients|
|high stomach acid (very low pH),
stronger immune system,
susceptibilty to arthritis and ulcers,
thinner blood that clots more slowly
|strenuous, aerobic exercise, such as running, bicycling, swimming, or weight lifting, early in the day||vitamin B complex (dark greens, nuts, fruits, meat, liver, fish, eggs, brewer’s yeast), vitamin K (kale, spinach, liver, egg yolks), calcium (sardines with bones, salmon, broccoli, parsley, sesame seeds, fenugreek, almonds, carob, millet), iodine (seafood, saltwater fish, seaweed, kelp, bladderwrack), manganese (clove), licorice, possibly de-glycyrrhizinated licorice|
|low stomach acid,
slower more adaptable digestion, weaker immune system, susceptibility to heart disease and diabetes,
thicker blood that clots more quickly
|calming, anaerobic exercise, such as yoga, stretching, brisk walking, golf, dance||vitamin B12 (miso, tempeh, natto, fish, eggs), vitamin C (citrus, pineapple, broccoli, berries, cherries), vitamin E (walnuts, peanuts, leafy greens), calcium (soy milk, tofu, almonds, spinach, broccoli, goat or sheep cheese, eggs, sardines), iron (beets, figs, molasses, lentils, beans), zinc (pumpkin seeds), selenium (garlic), chromium, hawthorn, echinacea, chamomille, valerian, milk thistle|
|tends towards O characteristics||balance of aerobic and anaerobic exercise||magnesium (dark green vegetables, chlorophyll), licorice (with caution), bromelain (pineapple), adaptogens (ginkgo biloba, ginseng, rhodiola), lecithin (soy)|
|tends towards A characteristics||calming, anaerobic exercise||vitamin C (lemon, grapefruit, pineapple, broccoli, berries, cherries), zinc (pumpkin seeds), hawthorn, echinacea, chamomille, valerian, milk thistle|
Statistically, blood type Os live longer than blood type As, but beware of statistics. You are not a statistic. You are an individual. While you are alive, you do not want to become a statistic.
Blood type eating has many skeptics and critics. From what I have observed, the critics have neither read the book nor tried the method for themselves.
The critics often claim that the blood type eating idea has been “debunked“. However, if you read their reference in detail, you find that blood type eating has never been fully tested in a group who by blood type have excluded completely what is to be avoided and included only what is beneficial or neutral. Who would sponsor such a trial? There is no patent at stake. Dr. D’Adamo responds to various critics.
The critics further claim that any health gain from blood type eating is merely due to eating more fruits and vegetables, in other words simply due to eating more healthy foods in general. This is possible, but overlooks ABO blood type antigens, lectins, and the selective reaction between blood type antigens and lectins, which has been known since the 1940s. It also overlooks the selection of specific vegetables, fruits, nuts, seeds, and protein sources based on the blood type eating idea and method. Some fruits and vegetables are healthy for one blood type but not for another.
Another criticism is that blood type eating is a “fad diet”. Dr. James Adamo published his book on this subject in 1980. His son published his book in 1996 and then published a revised edition in 2016. If this were a “fad diet”, then how did it last almost forty years? Many fad diets are promoted by one doctor or other advocate. Often, they have found what works for them and for their patients, but they overlook biochemical individuality. It proves nothing, of course, but the son claims to have sold more than seven million copies of his book, including translations to at least fifty languages. Also, Dr. Piero Mozzi, MD has independently confirmed blood type eating in his book. Is this evidence of a “fad diet”?
Sometimes the critics misrepresent the idea of blood type eating. They claim that is a “low carb, high protein” diet. These claims are nonsense. Carbohydrates include vegetables and fruits. D’Adamo and Mozzi recommend modest quantities of protein, either animal protein for types O and B or vegetable proteins for type A and AB.
Academics critics of blood type eating tend to point out that there is another, more detailed blood typing system called HLA (human leukocyte antigen). This system is used to reduce the risk of rejections of transplanted organs and bone marrow. It is independent of ABO blood types. This does not contradict the possibility that the ABO blood type is not only genetic, but also metabolic. They further claim that there are studies in the field of “nutrigenetics” or “nutrogenomics” that contradict the blood type eating idea. What are these specific studies? Be aware that many formal academic nutritional studies often contradict each other. Nevertheless, some of the academic critics can be real windbags on the subject of HLA blood types and nutrigenetics.
On the other hand, in my opinion one valid criticism is that the origin of different blood types is not clear. D’Adamo speculates that blood type O was the original hunter-gatherer blood type. According to him, blood type A then evolved to adapt to the cultivation of wheat, corn, and rice almost ten thousand years ago. Blood type B then evolved to adapt to a nomadic life, herding animals, and eating dairy. What is the evidence of this evolution? What is the evidence of the theory of evolution in general? This is not clear to me. All of these ancient wanderers are dead and gone. Earth to earth, ashes to ashes, and dust to dust. Also, the antigens that define the ABO blood type are also found in other species of animals than human beings.
What is also not clear to me is D’Adamo’s method to assign each specific food by blood type to each category – beneficial, neutral, or to be avoided. If you try to apply this method to other regions of the earth, such as Africa, Latin America, or Asia, where certain foods are common but not listed in his book, how would you determine the category of the food by the blood type, at least according to his method? This is not clear and not specified in the book. Perhaps D’Adamo and his father have simply kept records for the last fifty years and noticed patterns of foods and blood types. Perhaps there is no specific methodology other than this recognition of patterns. The book omits a methodology to explain the selection of foods by blood type.
Whatever the origin of blood types and the specific methodology of the selection, in practice this method works for many, many people, though not for everybody. It is based on lectins and observations of the selective reaction between lectins and the blood. This reaction either slightly coagulates the blood, slightly thins the blood, or has no effect on blood viscosity.
If you also apply other ideas, such as food combining, the acid-alkaline balance, detox, eliminations (sugar, dairy, and wheat), and chrono-nutrition, then you greatly increase the chance that blood type eating can work for you. It can even be cheap, particularly compared with the price of ill health, including:
- fruits and vegetables,
- either eggs, fish, chicken, turkey, or beef (for types O and B) or grains, beans, and legumes (for types A and AB),
- nuts and seeds, and
- herbs and spices.
Even within the same blood type, we are each individual. One possible approach is to look at the list of foods to be avoided for your blood type. If you eat any of the foods to be avoided for your blood type, you might avoid them for one to three weeks and substitute. See how you feel after a week. If you have more energy or feel better, continue.
If you have blood type A, avoid red meat for one to three weeks. Include good-quality eggs, fish, chicken, turkey, or vegatable protein instead, and then see how you feel. To complete the test, eat red meat again, and see how you feel. If you feel constipation, bloating, diarrhea, stomach pains, or excess gas after eating the meat, then you probably know that it is not healthy for you to eat red meat.
If you have blood type O, try avoiding all wheat (bread, cereal, pasta, biscuits, cakes, cookies, couscous, and beer), for one to three weeks, and then see how feel. Then eat some wheat, and see how you feel. If it interferes with your digestion, you then know in your heart that it is not healthy for you. Your soul wants you and your body to be healthy. Let it. Let go of your habits to gain your health.
Why do we have different blood types? What is the origin of each of the blood types? Nobody can answer these questions with certainty. It is a mystery. These questions are not relevant to the main questions – could this or does this work for you? This is what matters to you, not the theoretical details. You are the only one who can answer the question of whether this works for you, because you are the only one who can evaluate your digestion. If your digestion is already healthy, there is no reason to change your habits. If not, then you have nothing to lose by experimeting, changing your eating habits for one to three weeks. Then see how you feel.
Nota bene. The blood type eating idea and method have been independently described by Dr. Piero Mozzi, MD. A similar idea, metabolic typing, is related to blood type eating. Compared with identifying your blood type, identifying the metabolic type, fast or slow oxidizer, parasympathetic- or sympathetic-controlled, is not clear to me. By contrast, everybody knows or can find out their own blood type.
Other blood typing systems are known and used to transplant organs and to predict their compatibility. Other personal typing systems are also known, such a body type (ectomorph, endomorph, or mesomorph), “doshas” in Ayurveda, and the constitution in ancient Chinese medicine that is either cold or hot and either damp or dry. Perhaps these other typing systems have validity for health via food, but the ABO blood type is practical to apply. What do you value more – your health or your habits? A condensed version of this article in the form of slides is available here.
D’Adamo ND, Dr. Peter, “Eat Right 4 Your Type“, G.P. Putnam’s Sons, 1996 (revised in 2016)
Mozzi MD, Dr. Piero, “Dr. Mozzi’s diet. Blood types and food combinations“, P. Mozzi, 2017
Christiano ND, Dr. Joe, “Blood Types, Body Types And You“, Siloam, 2008
D’Adamo ND, Dr. James, “One man’s food–is someone else’s poison“, Health Through Herbs, 1980
“History of lectins …“, Glycobiology, vol. 14, nr. 11, 2004, slow pdf
Renkone, Dr. Karl O. 1948. Studies on hemagglutinins present in seeds of some representatives of leguminoseae. Ann. Med. Exp. Fenn. (Helsinke) 26: 66-72
Wu O, Bayoumi N, Vickers MA, Clark P, ABO(H) blood groups and vascular disease: a systematic review and meta-analysis., J Thromb Haemost. 2008 Jan;6(1):62-9. Epub 2007 Oct 25.
Harris, Jason B., C. LaRocque, Regina, Cholera and ABO Blood Group: Understanding an Ancient Association, Am J Trop Med Hyg. 2016 Aug 3; 95(2): 263–264, doi: 10.4269/ajtmh.16-0440