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Eating for Your Blood Type: O+ & O-

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o blood type diet

Have you ever wondered whether your blood type makes a difference to your health?

It certainly makes a difference when it comes to transfusions, and studies show some blood groups are more at risk of certain diseases—but there’s also an interesting theory that eating foods compatible with your blood type can make you healthier.

Blood type certainly makes a difference when it comes to blood transfusions.

RELATED: What Are the Blood Types Really for?

What’s the O Blood Type Diet About?

There are eight different blood groups: A, B, AB, and O; each group can be either RhD positive or RhD negative.

Your blood group is determined by the genes you’ve inherited from your parents, and this stretches right back to your stone-age ancestors.

The blood type diet is a theory that your blood group reveals the dietary habits of these predecessors.

The “Eat Right For Your Type” diet was created by Peter J. D’Adamo. He suggests that O was the first blood type. Type O has been traced back as far as Cro-Magnon man in 40,000 BC (although there is debate over whether type A is the earliest blood type).

These early type O humans ate a hunter-gatherer diet of animal protein, but as they moved into a society that put down roots and farmed crops, their blood evolved into type A to help them digest carbohydrate, fruits, and vegetables.

Rarer type B blood types are thought to descend from the ancient nomadic tribes that consumed dairy from their herds.  

His theory suggests that blood type O positive and O negative people have hunter-gatherer digestive systems that handle meat and fish better than carbs, grains, and dairy.

Blood type O positive and O negative people digest meat and fish better than carbs, grains, and dairy.

RELATED: Eating for Your Blood Type—B+ & B-

Does the O Blood Type Diet Work?

The O blood type diet has no scientific backing. There’s no medical research that indicates eating an O positive blood type diet or an O negative blood type diet will improve your health.

However, the idea is popular, and followers say they feel better adapting their diet to their blood type. Further, there are studies that show your blood type can have an effect on your health.

For example, type Os are thought to have less chance of coronary artery disease but more chance of peptic ulcers—so it’s not impossible that D’Adamo’s theory could be correct.

RELATED: Important Health Risks That Come with Your Blood Type

Eating for Your Blood Type: Type O

Type Os are able to eat more animal protein that blood types A, B, and AB because they have more hydrochloric acid in their stomach and secrete greater amounts of the intestinal alkaline phosphatase—and a lipoprotein called ApoB48.

These advantages make them better at digesting animal protein and fat and help them metabolize cholesterol more efficiently. D’Adamo also says this also increases their ability to heal their digestive tracts.

Lectins are proteins in food that bind to our blood cells and cause a chemical reaction. D’Adamo suggests this can cause difficulties if the food is not one your blood is easily able to digest. In Type Os, this can mean that metabolizing dairy or carbohydrate is difficult.

Type Os would have no issues with animal protein lectins, but they might struggle with dairy or grain-based lectins, which are more easily converted into fats and triglycerides and can cause inflammation.  

What to Eat on An O Blood Type Diet

What to Eat on An O Blood Type Diet

People with type O blood should focus on a high animal protein diet with vegetables, fish, and fruit. They should limit grains, dairy, beans, and legumes.

Good foods to eat include:

  • Meat, particularly lean meat—but not processed like bacon or sausages
  • Fish like cod, herring, and mackerel
  • Seafood with iodine
  • Fruits, particularly plums, prunes, and figs
  • Vegetables, in particular, leafy greens like kale

Because blood type Os digest meat more easily, an entirely vegetarian diet is not advised.

D’Adamo advises that alongside a blood type diet, type Os should exercise vigorously.

Aerobic exercises like running, cycling, and weight training suit blood type O, as they are potentially more prone to the stressful fight-or-flight response of our hunter ancestors. This can cause bouts of excessive anger, but dopamine from brisk exercise is an excellent way to counteract it.  

The more they work out and the higher the intensity, the better the blood type Os will feel.

Aerobic exercises like running, cycling, and weight training suit blood type O.

Foods to Avoid on An O Blood Type Diet

D’Adamo recommends that you avoid cereals, grains, dairy, legumes, and beans.

Specific foods to avoid include:

  • Wheat and corn
  • Legumes (podded beans)
  • Beans, especially kidney beans
  • Dairy, such as cow’s milk

He also suggests type Os avoid coffee, as their higher levels of hydrochloric acid could lead to peptic ulcers. Green tea is recommended instead, as it’s less irritating.

I’m O Negative—Does That Make a Difference to the Diet?

No, it doesn’t make a difference if you are O positive or O negative.

Positive blood has a protein on the surface of its red blood cells known as the Rhesus antigen. If you don’t have this protein, your blood is rhesus negative.

Around 85% of people in the USA have positive blood. It’s the most common type worldwide, but it doesn’t affect the blood type diet if you are rhesus negative.

You should eat based on whether you are blood type O, A, B, or AB.

Are There Any Risks?

There’s no evidence that this diet is risky, but it does encourage eating a lot of animal protein and fewer beans and grains, which can lead to health problems associated with a reduced fiber intake.

RELATED: The Absolute Must-Knows About FIBER (plus high fiber foods)

Should I Follow the O Positive Blood Type Diet?

If you want to follow the O blood type diet and don’t have any dietary needs, such as a sugar-controlled diabetic diet, then you may find it beneficial.

It’s important to make sure you eat all the necessary vitamins and minerals, or you run the risk of a deficiency that can harm your health more than eating certain blood type foods.

If you’re blood type O and fancy this diet, perhaps try it out for a few weeks, gradually introducing the right foods and phasing out the ones to avoid. After that time, reassess how you feel.

If you’re unsure whether a new diet is good for you, it’s best to seek professional medical advice first.

Sources:

https://www.webmd.com/diet/a-z/blood-type-diet

https://www.healthline.com/health/O-positive-blood-type-diet

https://www.livestrong.com/article/237156-blood-type-o-positive-diet-foods/

https://www.health.harvard.edu/blog/diet-not-working-maybe-its-not-your-type-2017051211678

http://dadamo.com/txt/index.pl?1004

 

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Comments

  1. Nancy Sue Frazier says

    Thank you! Your webpages are the Bomb! And I mean that in a good way. Yeah baby you dropped the best information on us for all to see. You are the ones who will save this planet. *S* Keep the Good News coming! Kudos to you all of this website. With Warm Regards, Nancy Sue Frazier. PS You are the answer to prayer, Amen

  3. san san ohn says

    Thank you for your webpages and they are very useful for me.This page let me know about the O type blood of positive and negative.I am so interest about them.I always like to eat the tender and good digest foods.Morning i like to eat cereal and milk for good digest.

  4. Insurance says

    What I wouldnt give to have a debate with you about this. You just state so many things that come from nowhere that Im pretty sure Id have a fair shot. Your blog is great visually, I mean people wont be bored. But others who can see past the videos and the layout wont be so impressed with your generic figuring of this topic.

  5. Anon says

    This bloodtype diet is a load of rubbish.

    I’m an o neg and eat avocados every single day. I don’t eat any meat or animal products and have never been healthier.

    I consume loads of nuts and legumes as well.

    There are not many people who agree with this theory.

    It’s more accurate to go by eye colour than it is blood type

    • JR says

      I agree. I rarely eat meat, especially red meat, and eat a lot of dairy myself (along with fruits & veggies of course). It sits well on my stomach and my body feels good with the way I eat. If I had to eliminate dairy from my diet I would be missing out on a big chunk of protein in my diet.
      I think sure this diet may accidentally work for some people, but it’s really very silly. There is so much more that goes into what’s right for each person than just their blood type. You can’t put people into a box, it just doesn’t work!

    • Tony says

      Like all ‘diets’ some work better than others for some people. I am a Type 1 diabetic with type O blood. I followed this plan and it worked wonders for me. No more heart burn. Off medication for 3yrs. No more insulin. That’s right!! I’ve been off insulin for 3yrs as well. This diet took 3mths to work for me. My HbA1c is 5.1 better than most ‘healthy’ people.

  7. Clara says

    I saw earlier in this info. 5 foods that you should never ear if you are type o and it didn’t say which foods these were, but it showed a banana. I am type o and I eat a banana every day and I am wondering if this is not good for me. I do have a lot of digestion problems and I am over weight now for the first time in my 74 years. Could you please respond to this question ?

    Thank you

  14. soknoni says

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  18. Kate says

    Waaaaait a minute! You said,

    “But even if you are a vegetarian there are plenty of sources of protein for you which are beneficial given your blood type. Some protein rich foods that they can eat safely are:

    Low fat yogurt
    Peanut butter”

    I was very disheartened when I first learned that yogurt and peanut butter were off limits for me, as I’m an O positive. I love and miss them both. Why are you giving people disinformation?

  21. Alexandra says

    I am a 0 type and I agree completely. 2 years ago I gave up coffee cause I just felt like it, not knowing coffee isn’t healthy for me in the first place. I tried a vegetarian diet long ago and it was pretty terrible, both physically and psychically. I am at my best when I eat right.

  24. Norm says

    I am an o + and now eat all the white meats pork,chicken,fish and cut out the dairy and vegetarian food only and have never felt better.i don’t feel as tied anymore and have the strength to do the long walk and biking something that I had ceased when I listened to a Natropath and dropped the white meat intake .
    This advice is rubbish ,everything in moderation and balance is what a good doctor wil tell you regardless of any blood group.

  25. Monaliza says

    thanks for the article, and i agree with it.
    i used to eat a lot lot of oranges, and always having difficulties in digestion. until i found out that this is the oranges and i stopped them, i also stopped coffee, and its working fine for me.

  27. Gaone Jack Siamisang (South Africa) says

    Ke utlwa seo lese buang ka O+ blood group, I’m also O+ and I believe the information you provided with.

    Please! Inform us of the deseases that can infect us and those that can not.

    Diet as well pls.

  28. Gaone Jack Siamisang (South Africa) says

    I analysed your info about O+ and O-. There is a lot of contradiction, you are not saying one concrete fact.

    I has been said that O+ can ONLY receive blood from O+, BUT it had been said that O- is universal, then why O+ can’t receive blood from O-?

    It had been contended further that O+ can donate to everybody, and there comes an inconsistency that O+ can only donate to A+,B+, which one should we believe?

    Why can’t O- receive blood from O+?

    I stand to differ with incosistencies which is submitted.

    We all know that Positive is better/stronger than Negative.

    We know that they ONLY differ when it comes to confirming infections which are diseases.

    O+ people can not be infected in totality no matter the diseases is, O- people, they can be infected BUT the diseases cannot grow.

    Then the question is, why do you say O- is unversal when it can be infected?

    I advice you to re-check what you wrote, give us one concrete information without contradiction.

    Opionions or assumptions never succeded.

    We all know that there was also a sick results that lacked from common sence That on 21 December 2012 there will be the end of the world.

    Be sure of your findings on O+ and O- because we will end up not taking you to our senses, we read differently, there are those who did not see the contradictions, BUt I did and trust that other Genius will.

    When it comes to died, I stand to deffer as well. Re-search well for your diet.

    Before you publish your information on your re-search, you must be sure of O+ and O- and stop contradictions.

  31. Brandon says

    In response to Gaone Jack Siamisang (South Africa)

    The “+” and “-” indicated the prescence or abscene of D or Rh antigen respectively. A person that lacks the D antigen(O-) can receive O+ blood if they haven’t been exposed to the D antigen. Most people are O+. So O negative can be considered the true universal donor. It can be given to anyone without the formation of ABO/D antibodies. There are many other red cell antigens to consider when transfusing blood. ABO/D antibodies are the usual suspects.

    Just to note about Type O being the oldest. That title actually belongs to type A. The O phenotype is really the result of a nonfunctional transferase that is used in attaching the specific sugars for Type A and B on the surface of the red blood cell. Nonfunctional genes do not become functional over the course of evolution. Evolution would not permit the formation of a gene it does not use. It always happens the other way.

  36. Ekowati says

    Interesting, and quite useless. Studies has shown that everything taken in moderation and sensibly is much more healthier that only eating certain foods. Couple that with a good exercise routine and you are set for life. Further more Where do get off telling people they can only eat dairy if they are vegetarians….? Also meat eating O positive people are not allowed to eat Brazil nuts but vegetarian can happily eat cashew and peanuts. Nuts are nuts you are either allergic to them or not. By the way eating too much nuts will increase the risk of Uric Acid, irrespective of what blood type you are.

    • CatnipsLazyDaze says

      Sorry, but your comment *nuts are nuts you either are allergic to them or not* is so incorrect. Do your research before you comment. I am allergic to peanuts but not tree nuts. Also you can drink dairy if you are a vegetarian. You can not drink dairy if you are vegan. SMH…

    • CatnipsLazyDaze says

      Sorry, but your comment *nuts are nuts you either are allergic to them or not* is so incorrect. Do your research before you comment. I am allergic to peanuts but not tree nuts. Also you can drink dairy if you are a vegetarian. You can not drink dairy if you are vegan. SMH…

    • CatnipsLazyDaze says

      Sorry, but your comment *nuts are nuts you either are allergic to them or not* is so incorrect. Do your research before you comment. I am allergic to peanuts but not tree nuts. Also you can drink dairy if you are a vegetarian. You can not drink dairy if you are vegan. SMH…

    • Wendy's Nook says

      Moderation is bull if you have food sensitive issues. You obviously do not and the issue is… we all have food sensitive issues but something at sometime draws out these sensitive issues when our immune system is compromise. So you obviously are lucky and have no auto immune issues. I am personally thankful for the research on blood type diet and is beneficial to me.

      • Gulf of Tomkin says

        Just because you are blood type 0 doesn’t mean you will have sensitivity issues. I live on all the items that are supposed to be bad for me yet win marathons and am quick thinking.

    • Wendy's Nook says

      Moderation is bull if you have food sensitive issues. You obviously do not and the issue is… we all have food sensitive issues but something at sometime draws out these sensitive issues when our immune system is compromise. So you obviously are lucky and have no auto immune issues. I am personally thankful for the research on blood type diet and is beneficial to me.

    • Wendy's Nook says

      Moderation is bull if you have food sensitive issues. You obviously do not and the issue is… we all have food sensitive issues but something at sometime draws out these sensitive issues when our immune system is compromise. So you obviously are lucky and have no auto immune issues. I am personally thankful for the research on blood type diet and is beneficial to me.

  38. Kathryn says

    I had gallbladder issues and almost died. I had been seeing a colon therapist who had told me about the O blood type diet and food combining many years before the gallbladder issue surfaced. I saw an acupuncturist who immediately put me on this O type program and I never felt better. I lost about 40 lbs in three months and my joints improved and also my energy. I recently started the food combining program with the O blood type program and lost 20 lbs. effortlessly. Have now stopped Ambien after fifteen years! Giving up the dairy has been vital. Still drink one cup of coffee with caffeine and raw sugar! One day at a time….My fibromyalgia has also improved. Also started meditation program.

  48. Ann Fuller says

    These O list above are not logical. Remove whitem dairy, and grains. O.k. but if one eliminate those why is it o.k. further down to eat rice noodles and crackers, and yougurt and chesese in the other lists?

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