How to Manage a Blood Type O Diet

By: Michael Lam, MD, MPH



Blood type O diets require a lot of proteinType Os thrive on intense physical exercise and animal protein. Unlike the other blood types, Type Os muscle tissue should be slightly on the acid side. Type Os can efficiently digest and metabolize meat because they tend to have high stomach-acid content. The success of the Type O Diet depends on the use of lean, chemical-free meats, poultry, and fish. Type Os don’t find dairy products and grains quite as user friendly as do most of the other blood types.

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Blood type Os do best with a high amount of proteinThe initial weight loss on the Type O Diet is by restricting consumption of grains, breads, legumes, and beans. The leading factor in weight gain for Type Os is the gluten found in wheat germ and whole wheat products, which interferes with insulin efficiency and slow down metabolic rate. Another factor that contribute to weight gain is certain beans and legumes (lentils and kidney beans) contain lectins that deposit in the muscle tissues making them less “charged” for physical activity. The third factor in Type O weight gain is that Type Os have a tendency to have low levels of thyroid hormone or unstable thyroid functions, which also cause metabolic problems. Therefore it is good to avoid food that inhibits thyroid hormone (cabbage, brussels sprouts, cauliflower, mustard green) but increase hormone production (kelp, seafood, iodized salt).

Several classes of vegetables can cause big problems for Type Os, such as the Brassica family (cabbage, cauliflower, etc.) can inhibit the thyroid function. Eat more vegetables that are high in vitamin K, which helps the clotting factor which is weak in Type Os. The nightshade vegetables can cause lectin deposit in the tissue surrounding the joints.

Because of the high acidity stomach, Type Os should eat fruits of alkaline nature such as berries and plums..

Your diet requires protein, stay balanced for blood type OType Os should severely restrict the use of dairy products. Their system is not designed for the proper metabolism. If you are a Type O of African ancestry, you should eliminate dairy foods and eggs altogether.

The physiological characteristics individuals with blood type O are predisposed and how their bodies deal handle different kinds of diets is also tied to how their bodies handle stress. The body’s stress response is governed by the neuroendometabolic (NEM) stress response system, made up of multiple neuroendocrine and metabolic circuits, functional systems that mitigate and minimize the effect of stressors on the function of different organs and areas of the body. These circuits all work together to ensure the body’s continued function is not in question every time a stressful occurrence or event arises.

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The archetypical blood type O physiology tends to have engender fragility in some components of the metabolic circuits of the NEM stress response. Accordingly, metabolic symptoms will likely arise first when the stress response system becomes disrupted or dysregulated such as weight gain and reduced exercise capacity. The first line of defense against such symptoms is first to adopt lifestyle practices to minimize stress and promote relaxation. On top of this, proper nutrition is another pillar critical to maintain proper metabolic health and a healthy body in general.

Blood Type O Details

See Detailed Type O Food Chart
A comprehesive list of what foods to eat on a diet for blood type O




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11 Comments

  • Jess says:

    I am Type O and I read that I can have dairy no more than 3 times a week, is that accurate? I use yogurt as a snack or as an alternative to sour cream and I was hoping I could still use it occasionally.

  • marcia says:

    I have been pretty regimental about what i have been eating for my blood type O for the past 2 weeks, i dont seem to be losing weight and have alot of flatulence, is this just a detox or am i doing something wrong

    • Dorine Lam RDN says:

      For blood type O – most important to avoid the following foods to lose weight: wheat (wheat and white flour products), corn, kidney beans, navy beans, lentils, cabbage, Brussels sprouts, cauliflower and mustard green.

      The blood type diet is fitting for most of the people. Due to tremendous variation in individual constitution, there is no guaranteed success with it. If you would like to follow the blood type diet, I would recommend that you follow it vigorously for 3 months, even though you don’t see much harm or benefit in certain food. After 3 months, if you see no improvements in your health, then you can deviate and use the blood type diet as a general guideline and not overeat the foods that should be avoided for your Blood Type, but take them with care and in small amounts.

      Also follow the following as a guide:Blood Type O, Metabolic Syndrome

      Flatulence may happen if the diet is very different from what you used to be eating. You may want to take some digestive enzymes to help you digest your food better. You can find some good ones from http://www.supplementclinic.com.

      Dorine Lam, RDN , MS, MPH
      Registered Dietitian and Senior Holistic Nutritionist

  • Mary says:

    Was wondering / hoping fresh salmon as opposed to smoked salmon is ok for blood type o+. Also in regards to eggs, should they be eliminated completely? I find thet give me a great source of energy and tide me over to the next meal.

    • Dorine Lam RDN says:

      For blood type O, You can take fresh wild or farmed salmon, but do avoid smoked salmon, which is not allowed for all blood types. Eggs is allowed occasionally.

      Low energy and tiredness is a warning sign that the body is running out of fuel and usually points to underlying problems. If your doctor cannot find anything wrong with you, consider Adrenal Fatigue as a possible cause. When your adrenals are weak, the body may be unable to handle normal emotional and physical demands of daily living due to metabolic and hormonal imbalances. The body has to draw on its internal reserves, and this may lead to depletion and thus a sense of low energy, feeling tired in the morning despite rest, having to drag yourself to complete your work, and drained by the end of the day.

      Dorine Lam, RDN, MS, MPH
      Registered Dietitian and Senior Holistic Nutritionist

  • Ebony Burnett says:

    Can this diet help me gain weight as well? I am having trouble packing on lbs and then if I do gain weight I can’t keep it on. Also, I have acid reflux which from my understanding is low stomach acid .. Is this common in type O’s?

    • Dorine Lam RDN says:

      There may be other issues that cause your inability to gain weight. You should consult your doctor to see why you are having difficulty in gaining weight.

      To help improve your acid reflux, consider the following :

      Take a digestive enzymes 1/2 hr before each meal.
      Do not take any liquids with your meals and within 1 hour after your meals.
      You should also eat 5-6 small meals.
      Do not lay down flat immediately after you eat.
      Avoid spicy foods.
      I also recommend for you to take some probiotics to help strengthen your overall digestive system.

      Dorine Lam, RDN , MS, MPH
      Registered Dietitian and Senior Holistic Nutritionist

  • precious says:

    I’m always constipated, I dont know what to drink anymore, of late I’m having a hip pain that is terribly painful, BT after using laxative it becomes better, I drank almost everything, I even went to hospital CD of constipation, they said my intestines ate full of feases, I don’t know how to clean that please help. Fons

    • Dorine Lam RDN says:

      If you are always constipated, you need to look at the underlying issues. Many a times, I find it is a symptom of Adrenal Fatigue Syndrome. So taken care of the adrenals may improve the digestive system. You may want to the the Adrenal Fatigue Syndrome Test to find out if you have AFS or onot.

      Dorine Lam, RDN, MS, MPH
      Registered Dietitian and Senior Holistic Nutritionist

  • Este Zurnamer says:

    I have difficulty loosing weight. Crave a lot for sugar and salt.

    • Dorine Lam RDN says:

      For blood type O – most important to avoid the following foods to lose weight: wheat (wheat and white flour products), corn, kidney beans, navy beans, lentils, cabbage, Brussels sprouts, cauliflower and mustard green.

      The blood type diet is fitting for most of the people. Due to tremendous variation in individual constitution, there is no guaranteed success with it. If you would like to follow the blood type diet, I would recommend that you follow it vigorously for 3 months, even though you don’t see much harm or benefit in certain food. After 3 months, if you see no improvements in your health, then you can deviate and use the blood type diet as a general guideline and not overeat the foods that should be avoided for your Blood Type, but take them with care and in small amounts.

      Also follow the following as a guide:Blood Type O, Metabolic Syndrome