Peter D'Adamo, author of "Eat Right for Your Type," asserts that because of evolution, individuals of the different blood type groups are predisposed to certain health-related conditions and have different nutritional needs. Ancestors of O blood types were hunter-gatherers and may require more meat, for example.Although this theory is somewhat controversial, many people follow the blood type eating method. Check with your health care provider before making any changes to your existing diet.
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Dr. D'Adamo explains that O blood types are the most common blood type on the planet. He warns, however, that they should avoid gluten-containing grains such as wheat and corn. Whole grains like oats and brown rice are acceptable alternatives. His personalized nutrition guide notes that O's tend to be gluten-sensitive or even have allergies to gluten products. Avoid all baked goods containing wheat, corn and barley. This includes bread, pasta and many cereals. Instead look for gluten-free pastas; breads made with spelt, a wheat alternative; and granola-type cereals made from oats instead of wheat or corn.
Meat and Other Animal Products
Historically, O blood types were either hunters, gatherers, explorers or a combination of two or more. They were primarily predators and developed aggressive instincts and physical responses such as the fight or flight response in order to survive. They thrived mainly on a diet of meat, organ meats and the types of fruits, vegetables and nuts that needed little cultivation. Dr. D'Adamo recommends mostly red meats, organ meats and cold water fish for O blood types. This includes beef, lamb, buffalo, venison, liver, heart, salmon and halibut.
Fruits and Vegetables
Ancestors of O blood types originated from harsh climates. They learned to hunt and ate what foods were local to their area. They would dig for roots, collect nuts, berries and other edible plants. They did not learn to cultivate grain crops until much later. Because of this history, Dr. D'Adamo claims O blood types should avoid foods that are not native to their environment and need extensive cultivation. Acceptable fruits and vegetables for this type include native nuts, wild berries, locally grown fruits, dark green leafy vegetables and root vegetables such as carrots, beets and radishes.
Dr. D'Adamo warns that dairy is also considered an allergen for O blood types and should be avoided. This includes milk, yogurt, cheese and ice cream. Dairy alternatives such as soy milk, soy yogurt and tofu products are acceptable on the blood type diet. Because dairy is an important source of calcium and vitamin D, look for calcium-enriched and vitamin-fortified soy products. There is insufficient scientific evidence to support abstinence from dairy, however. Check with your doctor before eliminating these items from your diet, especially if you have been diagnosed with osteoporosis or vitamin D deficiency.