For people in the O blood group, most lean meats that are organically fed are recommended to include in the diet.

The best types of protein sources that have a beneficial effect for people with blood type O positive and O negative are beef, veal, lamb, venison, and also most poultry. If you don’t eat meat, but prefer seafood there is plenty of choice of fish that you can enjoy. For example, cod, trout, herring, tuna, and mackerel are excellent foods to eat on the O blood type diet because they are a good source of iodine which is necessary for a healthy thyroid gland.

What meats to avoid

There are some meats that must be avoided if you are following the type O diet. These include most processed foods like bacon; in fact, any pork products are a definite no-no for people with O positive or O negative blood type. From seafood products, you should definitely not eat octopus and salmon roe (caviar) if you have blood type O.

So, from protein sources, there is a wide variety of meats and seafood to choose from for people in the blood O group.


People who have blood group O need to be careful with the type of beans and legumes that they consume. Some beans are excellent for the O type blood group; however other legumes should be avoided. According to Dr. D’Adamo, people with O type blood often suffer from thyroid disorders and certain beans can either help the thyroid or slow down the thyroid.4

If you follow the blood type O diet you can include black beans, adzuki beans, and green (string) beans. Beans are also a valuable source of proteins and many beneficial nutrients. These types of beans help the thyroid gland to produce enough thyroid hormone for the body.

What beans and legumes to avoid

There are some beans and legumes which should be completely avoided by people who have blood type O. These are soybeans, lentils, green peas, and peanuts, including peanut butter. These foods are best avoided by people with O type blood because they are either harmful to you or provide no benefit at all.


Many fruits are beneficial for people who are in the O blood group. This is because some fruits help to regulate the stomach acid, which people with blood type O tend to have much more of.

Some of the best fruits for people with O blood group are plums, figs, and prunes because they help to lower stomach acid and keep your digestive system working effectively. Berries like raspberries, gooseberries, and cranberries can be eaten occasionally.

What fruits to avoid

Although most fruits are a good source of vitamins, there are a number of fruits that you should not eat if you are in the O blood group. The fruits to avoid in the blood type O diet are oranges, blackberries, strawberries, kiwifruit, and melons. This is because these negatively affect your metabolism or enhance toxins of other foods if you have O positive or O negative blood type.


There are many vegetables that are beneficial if you follow the O type diet. Leafy green vegetables are the best kind for people with O type blood because they are rich in vitamins and minerals and help to reduce blood clotting problems.

According to the blood type O diet, you can eat plenty of green leafy lettuce, kale, broccoli, okra, red peppers, and ginger root. These will help to keep you healthy and maintain your proper weight.

What vegetables to avoid

Other types of vegetables like cabbage, cauliflower, and Brussels sprouts, should definitely be avoided because they can affect thyroid hormone production. Also, you shouldn’t eat mushrooms and pickled vegetables if you are on the O blood group diet because they can cause inflammation in the digestive lining.


For people with blood type O (negative or positive), most dairy products should be avoided. This includes yogurts and most cheeses and eggs. However, small amounts of butter and mozzarella can be consumed on the blood type O diet.


Apart from what I’ve already mentioned about what to eat and what not to eat on the blood type O diet, there are some other dietary restrictions:

  • It is also advisable for people in the O blood group to completely avoid grains including wheat bread because the gluten in grains interferes with how the body processes insulin.
  • According to D’Adamo, rice, spelt, amaranth, quinoa and millet can be beneficial if you have O blood type.
  • Most alcoholic beverages and caffeinated drinks are a big no-no for people with blood type O. However, you can drink wine, water, and tea.



2 of 3
Open Next Page to continue reading...