Peter J. D’Adamo, a naturopathic doctor famous for his book, “Eat Right 4 Your type,” explores the connection between the history of the blood types in connection to their origins and how it may affect a person’s ability to eat and digest certain types of foods. Following this diet, you can decrease your susceptibility to cancer, diabetes and other illnesses, while also improving energy levels and the health of your body.

Blood Type A -The Vegetarian, an informative website on the blood type diet, claims that type A blood initially appeared in Asia or the Middle East between 25,000 and 15,000 B.C. in response to the rapidly dwindling supply of meat, leading to the cultivation of grains. Over time, the adaptations that produced Blood Type A needed to fully utilize nutrients from carbohydrate sources. These biological adaptations can be observed today in Type A’s digestive structure. Low levels of hydrochloric acid in the stomach and high intestinal disaccharide digestive enzyme levels allow a more efficient digestion of carbohydrates. Along with these, low levels of intestinal alkaline phosphotase make it difficult for Type As to digest and metabolize animal protein and fat.

Individuals with Type A blood thrive on a plant-based diet and should consume large amounts of vegetables, lentils, soy beans (and soy products), pinto beans, black beans and whole grains. Berries and plums are also beneficial. Occasional consumption of poultry and fermented dairy products is also well recommended.
Individuals with Type A blood should eliminate all meat products, whole fat dairy products, peppers, tomatoes, and tropical and citrus fruits from their diet.
Blood Type B-The Balanced Omnivore

Type B blood developed sometime between 10,000 and 15,000 B.C. in the area of present day Pakistan and India. In the migration from a hot climate to a colder one, blood type B may have initially mutated in response to climatic changes. The Mongolians swept northward, pursuing a culture dependent upon herding and domesticating animals, � as their diet of meat and cultured dairy products reflected.
The diet for individuals with Type B blood is more varied than the other blood type diets. If you have Type B blood, you are encouraged to eat seafood, beef, lamb, and dairy products. Oats and millet, green vegetables, and all fruits are beneficial as well.

Individuals with Type B blood are encouraged to avoid chicken, bacon, ham, and shellfish entirely. It is recommended that individuals with Type B blood limit consumption of beef, wheat, rye, tomatoes and corn.

Blood Type AB-The Moderator
Type AB blood is rare-  it’s found in less than five percent of the population, and it is the newest of the blood types. Until ten or twelve centuries ago, there was no Type AB blood type. Type AB resulted from the intermingling of Type A with Type B. Thus, they share both the benefits and the challenges of both Type A and Type B blood types.

Individuals with Type AB blood are encouraged to eat lamb, turkey, cultured dairy products (yogurt and sour cream), eggs, rice, tofu, plums and cherries.
Individuals with Type AB blood must strictly avoid all smoked or cured meats and limit consumption of beef, wheat, corn, tropical fruits, oranges and bananas.
Blood Type O-The Carnivore
All humans initially shared type O. These early humans were skilled hunters, and thrived on a meat-based diet.

Individuals with Type O blood are encouraged to explore the importance of animal flesh and vegetables. It is recommended to eat lean beef, lamb, turkey, chicken, and seafood. In addition, azuki beans, pinto beans, kale, collard greens and all fruits are considered to be beneficial.

Individuals with Type O blood must strictly avoid eggs and dairy foods, breads and pastas made from wheat, cabbage and brussel sprouts, and corn.

For more information on foods that should or should not be eaten visit,, an online guide for naturopathic techniques.