There are four different blood types.
"Eat Right For Your Type" is a book by Dr. Peter D'Adamo that details the Blood Type Diet. D'Adamo created the diet based on the theory that eating according to your blood type can promote better health. The foods that you're permitted to eat depends on what blood type you have. Certain foods are allowed for some blood types while other foods are not. Knowing your blood type is the first step, but you should always ask your doctor before starting the diet program.
Between 40 and 45 percent of Americans have type O blood, according to D'Adamo in his book, "Eat Right 4 Your Type: Complete Blood Type Encyclopedia." Eating for this blood type requires you to limit your intake of grain- and legume-based carbohydrates, such as bread, beans and pasta. You should also limit your intake of dairy foods such as milk, cheese, yogurt and ice cream. Foods on the approved list include lean beef, chicken, turkey, fish, fruits and vegetables, though there are a few exceptions. Type O people should avoid coffee, beer, tea, ketchup, vinegar, avocado, Brussels sprouts, cabbage, poppy seeds and pork.
Between 35 and 40 percent of Americans have type A blood, D'Adamo notes. If you have type A blood, you'll need to limit your intake of chicken, turkey and dairy foods such as milk and cheese. Your diet should include plenty of fish, beans, whole grains, fruits and vegetables. Like people with type O blood, there are a few foods that you should completely eliminate from your diet. These include beef, pork, shellfish, pistachios, lima beans, mushrooms, tomatoes, potatoes, beer and black tea.
If type B is your blood type, you're in a group that consists of 4 to 11 percent of Americans, D'Adamo reports. You'll need to limit your intake of beef and turkey, but you can eat game meats including rabbit and venison. Lamb and fish are also approved if you have type B blood. Type B people should eat plenty of fruits, vegetables, dairy foods, rice and oatmeal, too. Foods to eliminate from your diet include lentils, beans, wheat, pumpkin, corn, olives, coconut, ketchup, beef, chicken, pork and shellfish.
Only up to 2 percent of the population has type AB blood. Eating with this blood type combines certain aspects of eating for type A and type B blood types. If you have type AB blood, you should eat plenty of fruits, vegetables, whole grains, beans, nuts, cheese, eggs, yogurt, lamb, turkey and fish. At the same time, you should also avoid beef, pork, chicken, shellfish, aged cheeses, sunflower seeds, corn, bell peppers, oranges, tropical fruits and pepper.