Blood Type Diet

The blood type diet works according to lectins. Lectins are diverse proteins found in foods and have agglutinating properties that affect your blood. Lectins are ways for organisms in nature to attach themselves to other organisms in nature. 

The lectins are like super-glue allowing the cells they are a part of attach like suction cups to other cells. Food contains lectins. When you eat food that is not compatible with your blood type, lectins target an organ or bodily system (kidneys, liver, brain, stomach, etc) and begin to agglutinate blood cells in that area. These reactions can be considered mini-allergic reactions that are unhealthy.

This is why you want to eat according to your blood type. In some severe instances, agglutination of blood cells can block arterial blood flow and lead to a stroke. This was believed to have occurred in one of Dr. D’ Adamo’s patients that were eating against his blood type.

Red blood cells floating around in a red mediumBlood

Benefits of following your blood type diet plan carefully

1) Avoid many common viruses and infections.

2) Lose weight, as your body rids itself of toxins and fats.

3) Fight back against life-threatening diseases such as cancer, cardiovascular disease, diabetes and liver failure. 

4) Avoid many of the factors that cause rapid cell deterioration, thus slowing down the aging process. 

Type O Diet

Foods that tend to cause weight gain in the type O and should be avoided: wheat gluten, corn, kidney beans, navy beans, lentils, cabbage, brussel sprouts, cauliflower and mustard greens.

Foods that encourage weight loss for type O: Kelp, seafood, Iodized salt, liver, red meat, kale, spinach, broccoli

The type O should eat lean beef, lamb, turkey and chicken as often as wanted.

Seafood should be a big part of the type O diet. 

Type O should severely restrict their use of dairy products. Make sure to take a daily calcium supplement, especially if you are a woman because dairy foods are the best source of absorbable calcium.

Type Os respond well to oil especially linseed (flaxseed) oil and olive oil.

Nuts and seeds don’t hurt the type O but should be avoided if you are trying to lose weight. The most beneficial nuts for the type O are pumpkin seeds and walnuts.

Beans should be eaten occasionally.

Wheat products should be eliminated entirely.

Avoid breads and muffins except essene bread and ezekiel bread.

Grains and pasta are not highly beneficial to the Type O. 

There are many beneficial vegetables for the type O and some realty bad vegetables. Make sure to review page 67 and 68 of “Eat Right 4 Your Type.”

With fruits there are some that are beneficial such as figs, plums and prunes. Most fruits are neutral towards the type O and several types of fruits should be avoided such as strawberries, oranges, blackberries, coconuts, melon-cantaloupe, melon- honeydew, rhubarb, tangerines and plantains.

Highly beneficial juices and fluids are black cherry, pineapple and prune. Avoid apple, apple cider, cabbage and orange juice.

Type A Diet

It is important for those with type A blood to eat as close to natural as possible. This means organic veggies. Type A has a sensitive immune system and is predisposed to heart disease, cancer and diabetes.

Type As are opposite Type Os. The Type A has less stomach acid production, which isn’t conducive to the consumption of meat. Type A people will convert animal meat into fat.

Type As should also avoid diary or eat it rarely.

Foods that encourage weight gain with the type A blood type are meat, dairy foods, kidney beans, lima beans and wheat (in overabundance).

Foods that encourage weight loss in the type A blood type are vegetable oils, soy foods, vegetables and pineapple.

Make sure to eliminate meat if you’re a type A. If this is difficult, first try substituting fish for meat and go from there. Neutral meats if you must have meat are chicken, turkey and Cornish hens.

A lot of seafood is beneficial to the Type A: Carp, cod, grouper, mackerel, monkfish, pickerel, red snapper, rainbow trout, salmon, sardine, sea trout, silver perch, snail, whitefish, yellow perch.

Type As can eat small amounts of some dairy: yogurt, kefir, nonfat sour cream, and cultured dairy products.

Highly beneficial oils to the type A are linseed (flaxseed) oil and olive oil.

Nuts and seeds are good for the type A because they provide protein, which is needed since animal meat is not ok. Best nuts to eat are peanuts, peanut butter and pumpkin seeds.

Type As thrive on the vegetable proteins found in beans and legumes. Highly beneficial beans are aduke, azuki, black, green, pinto, red soy, the lentils: domestic, green, red and black eyed, peas. Beans to avoid are copper, garbanzo, kidney, lima, navy, red and tamarind.

Cereals are fine for the type A, include millet, soy wheat, cornmeal and whole oats into your diet.

Supported breads and muffins are essene bread, Ezekiel bread, rice cakes, soya flour bread, sprouted wheat bread.

A blue bowl full of eats with two scoopers inside the bowl to scoop out the oat contentOats

Type B Diet

Biggest causative factors for weight gain in the type B are corn, buckwheat, lentils, peanuts and sesame seeds.

Foods the encourage weight loss for type Bs are green vegetables, meat, eggs/low-fat dairy products, liver and licorice tea (never take licorice supplements without a doctor’s supervision. Licorice tea is okay).

Type Bs should give up chicken which isn’t easy.  Highly beneficial meats are lamb, mutton, rabbit and venison. Avoid bacon, chicken, cornish hens, duck, goose, ham, heart, patridge, prok and quail.

Type Bs do well with seafood.  Seafoods to avoid are anchovy, barracuda, beluga, bluegill bass, clam, conch, crab, crayfish, eel, frog, lobster, lox, mussels, octopus, oysters, sea bass, shrimp, snail, striped bass, turtle and yellow tail.

Dairy products are ok in the Type B but avoid American cheese, blue cheese, ice cream and string cheese. Highly beneficial dairy products are cottage cheese, farmer, feta, goat cheese, goat milk, kefir, mozzarella, ricotta, skim or 2% milk, yogurt, yogurt with fruit, yogurt frozen.

Olive oil is highly beneficial to the type B. Use at least one tablespoon every other day.

Nuts and seeds are not recommended for the type B. If you must have them there are some neutral sources such as almond butter, almond nuts, brazil nuts, chestnuts, hickory nuts, litchi nuts, macadamia nuts, pecans and walnuts.

Some beans and legumes are ok for the type B such as kidney, lima, navy and red soy beans. Other beans such as lentils, garbanzo, pintos and black-eyed peas should be avoided since they interfere with insulin production.

Wheat is not good for type Bs and rye is also not good for type Bs. Highly beneficial cereals are millet, oat bran, oatmeal, puffed rice, rice bran and spelt. Make sure to avoid amaranth, barley, buckwheat, cornflakes, cornmeal, cream of wheat, kamut, kasha, rye, seven-grain, shredded wheat, wheat bran and wheat germ.

Eat veggies three to five servings a day but eliminate tomatoes completely from you diet. While a lot of  veggies are ok for a type B some should be avoided: domestic artichoke, Jerusalem artichoke, avocado, white corn, yellow corn, black olives, green olives, Greek olives, Spanish olives, pumpkin, radishes, mung sprouts, radish sprouts ,tempeh, tofu and tomato.

Fruits are fine. There are a few to avoid: coconuts, persimmons, pomegranates, prickly pear, rhubarb and starfruit.

Yogurt in a glass served with granola, two glasses each filled this way. With two spoons nearby to eat the yogurt with.Yogurt is good

Type AB Diet 

Type AB unlike the other blood types can tolerate tomatoes well.

Foods that encourage weight gain in the type AB are red meat, kidney beans, lima beans, seeds, corn, buckwheat and wheat.

Foods that encourage weight loss for the type AB are tofu, seafood, diary, green vegetables, kelp and pineapple.

Some meat is advisable for the type AB blood type but stay away from chicken. Avoid all smoked or cured meats. Highly beneficial meats are lamb, mutton, rabbit and turkey.

Type AB have a lot of available choices for seafood: Albacore, cod, grouper, hake, mackerel, mahimahi, monkfish, ocean perch, pickerel, pike, porgy, rainbow trout, red snapper, sailfish, salmon, sardine, sea trout, shad, snail and sturgeon.

For dairy AB types eat like B types. You can benefit from yogurt, cottage cheese, farmer, feta, goat cheese, goat milk, kefir, mozzarella, ricotta and sour cream (non-fat) Dairy to avoid are American cheese, blue cheese, brie, butter, buttermilk, camembert, ice cream, parmesan, provolone, sherbet and whole milk.

For oil, type AB should use olive oil instead of animal fats or hydrogenated vegetable fats or other vegetable oils.  Oils to avoid are corn, cottonseed, sesame and sunflower.

Eat nuts in small amounts and with caution. Avoid poppy seeds, pumpkin seeds, sesame butter, sesame seeds, sunflower butter, sunflower seeds and filbert nuts. Especially good nuts are peanuts, chestnuts, peanut butter and walnuts.

Some beans are great and help fight cancer for AB types such as lentils but on the other hand beans such as kidney and lima beans slow insulin production in Types As and do the same in Type ABs.

ABs do well on grains but make sure to limit the amount of wheat you eat since the inner kernel of the wheat grain is highly acid forming. Other cereals to avoid are buckwheat, cornflakes, cornmeal, kamut and kasha.

Breads and muffins are ok in the type AB unless you are overweight. The only real muffin or bread to avoid are corn muffins. Especially good breads and muffins are brown rice, fin crisp, rice cakes, 100% rye, rye crisps, rye vita, wasa bread, sprouted wheat bread, soy flour bread, essene bread and Ezekiel bread.

Type AB benefit from a diet rich in rice rather than pasta. Highly beneficial rices are basmati, brown, white and wild. Avoid buckwheat kasha, artichoke pasta and soba noodles.

Type AB can eat a wide variety of vegetables. Tofu should be eaten often because it contains anti-cancer properties. Some vegetables to avoid are green peppers, jalapeno peppers, red peppers, yellow peppers, radishes, mung sprouts, radish sprouts, lima beans, black olives, avocados, white corn, yellow corn, domestic artichokes and Jerusalem artichokes.

Fruits are well tolerated except for bananas, coconuts, guava, mangoes, oranges, persimmons, pomegranates, prickly pears, rhubarb and starfruit (carambola). 

A prickly pineapple standing upright with its plume of green attached at the top.Good for weight loss in type AB


The blood type Diet works around what are called lectins. Some lectins from food don’t go along with some types of blood types causing agglutination. To me, these are what I called micro-allergic reactions that are not wholesome to the body. It reminds me of diets that tell you to stay away from wheat because some people are allergic to wheat. This is a more specific example of why one should stay away from certain foods.

The diets don’t by any means look easy. For example, I’m a type A negative blood type and the type A diet is basically telling me to become a vegetarian. I won’t become a vegetarian because chicken is labeled a neutral food. I can eat that once in awhile. After having studied science for so long I believe in the background science about this type of diet.

It is very interesting and I definitely believe there are some foods for whatever reason that clog up my metabolism or prevent me from burning fat when I should have otherwise burnt plenty of fat. I have also eaten veggies before and I do respond extremely well to veggies so I give credit to him saying veggies are the foundation of the type A diet.

I think you may be surprised at how effective this diet may be for you. I’m going to give it my best shot for the next few weeks to see what it can do for me. It will be difficult for me to give up a lot of meat but I think it may be worth it. I think this Doctor is onto something? What is there to lose? It may very well shock you.

Get Dr. Peter J.D' Adamo's "Eat Right 4 Your Type" today to get all the facts about how to eat right. Also don't forget to see his other publications for eating that are specific for each eating type: 

Type A

Type B

Type O

Type AB

› Blood Type Diet
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