Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages
Mag360 Top Banner



The “Fad Diet” That Might Just Save Your Life – Part II: Being Type O


In the last installment of this series, we discussed some basic concepts and misconceptions about the Blood Type . As promised, we’re now going to explore the scientific foundation that makes each blood type unique, and why each requires specific dietary attention.

Before I was introduced to the science behind the Blood Type Diet, and to naturopathic medicine for that matter, I was a vegan. I ate foods like tofu and tofurkey, believing I was making a health choice that would prevent disease, give me energy and keep me slim. Unfortunately, being vegan was the worst possible dietary decision I could have ever made — because my blood type is O.

What Makes Blood Type O Blood Unique

Making up 44% of the U.S. population, type O blood is the most common blood type found here in America.There are three main characteristics set those with type O blood apart:

1. Blood cell characteristic: As we learned from my previous article, blood type O has no antigens, which is why it is revered as the universal donor blood type.

2. More stomach acid: People with type O blood tend to have a higher level of hydrochloric acid in their stomachs making it easier for them to digest specific types of food.

3. Higher levels of IAP: Type Os also possess a higher amount of an enzyme called intestinal alkaline phosphatase, or IAP. In fact those with type O blood have almost three times the amount of this enzyme than those with any other blood type.

These biological differences, however, also make those with blood type O more prone to certain conditions. For example, if one with type O blood is not eating properly, the increased level of stomach acid (hydrochloric acid) makes a type O individual more prone to stomach ulcers.

Type Os are more susceptible to insulin resistance, sluggish thyroid activity and other metabolic issues. As a result of many with type O blood battle fatigue and and can have difficulty losing weight.

The Very First Blood Type

Genetically speaking, blood type O is believed to be the oldest of the blood types and to have served as the platform from which the other 3 types developed. Understanding this helps to understand the type of foods best tolerated by people with this blood type.

The earliest populations were “hunter-gatherers” and, as such, they did not harvest grains or consume dairy products. They did, however, hunt animals and forest for and seeds.

The blood type O individuals of these early populations would not fare well in today’s world of processed foods, harvested grains and dairy products because that is not what their bodies were designed to use as fuel. Because of this, the basic dietary rule for a type O person is to eat protein, protein and more protein–with plenty of type-O-friendly vegetables on the side of course!

And since those with blood type O have a higher level of hydrochloric acid in their stomachs in addition to three times as much IAP, they can digest meat proteins and lipids significantly easier than those with other blood types.

In fact, the enzyme IAP is responsible for splitting dietary structures; a process which ultimately helps the body breakdown and excrete . The other important fact to know about IAP is that it is activated when the individual ingests protein. Bottom line here is that type O individuals who eat high quality (organic and hormone free, please) animal protein stand to actually lower their .

So What Should One With Type O Eat?

The short answer is that one with type O blood should focus on proteins in addition to foods that are alkalizing to the body such as berries and plums.

Remember lectins? Lectins in certain foods can aggravate the sluggish thyroid and reduce overall metabolic function in type Os. But don’t worry, that sluggish metabolism can be kicked into high gear by eating high quality protein and vegetables.

Foods to eat: Type O individuals can enjoy foods such as beef, buffalo, lamb, venison, cod, halibut, herring, mackerel, pike, rainbow trout, red snapper, salmon, sardines, shad, snapper, sole, yellowtail, kale, spinach, , artichokes, sea kelp, seaweed, okra and sweet potatoes.

Foods to avoid: Some of the “bad lectin” containing foods that are likely to slow your metabolism include wheat, barley, corn, potatoes, cauliflower, lentils, cabbage, navy beans and kidney beans. It is highly recommended that people with type O blood avoid gluten.

Below is an excellent, comprehensive chart from Blood Type Diet expert Dr. Michael Lam. If you’re a blood type O individual, this is a great chart to bookmark or Pin to your Pinterest page for later reference.  You can also print this chart by clicking this link.

Exercise and Stress reduction

These two go hand in hand with type O individuals. Consistent exercise is the number one most important thing for managing stress in type Os and the word “vigorous” sums up the type of exercise needed. Anything that gets their blood pumping and the body sweating is a good place to start. Most Os benefit from running, hiking, weight training and aerobics. Doing any of these activities 3-4 times per week will not only help with stress reduction and weight loss but will also help type Os balance their neurotransmitter levels which is important for warding off depression, and issues.

Earlier we learned that type Os have a higher amount of stomach acid. While this is great for breaking down proteins, unfortunately this also means they are more susceptible to ulcers. Another reason to eat foods that are type O friendly and to stick to a vigorous work out schedule to reduce overall stress!


For more information about specific foods for Type O please visit www.d’ or contact your local naturopathic physician.

“Blood Types in the U.S” 2008-06-20. Retrieved 2012-12-14.

Shreffler, D.C. American Journal of Human Genetics. 1965 January; 17(1): 71–86.
Genetic Studies of Blood Group-Associated Variations in a Human Serum Alkaline Phosphatase


Dr. Kinney, owner of KinnCare Inc. is a practicing Naturopathic Doctor who specializes in caring for patients suffering from anxiety, depression, gastro-intestinal disorders, hormonal imbalances and adrenal fatigue. Using personalized diet, lifestyle modification, genetic testing and counseling, homeopathic remedies, and herbal medicine, she is able to balance and boost the body’s natural regenerative capacity and help her patients overcome disease. She received a bachelor of arts from Vanderbilt University and is a summa cum laude graduate of the University of Bridgeport College of Naturopathic Medicine (UBCNM).

Dr. Kinney is currently vice president of the Maryland Naturopathic Doctors Association and an active member of the American Association of Naturopathic Physicians. She enjoys running, yoga, reading, and spending time with her husband and 2 little girls. For more information about her practice visit or follow her on facebook.

Healthy Living Starts Here

Never miss out on valuable information. Subscribe to our newsletter today!

Leave a Comment Below

8 responses to “The “Fad Diet” That Might Just Save Your Life – Part II: Being Type O”

  1. Marsha Dean says:

    Type O blood. Do you have a list of HIGH PROTEIN foods for a vegetarian with type O blood. I do eat fish, but not meat. Is garbanzo beans or black beans, and brown rice recommended?

    • Garbanzo beans (or chick peas) cause bloating for me, but black beans are fine. I think the adzuki (or aduki) have the best ratio of protein to carbs, so I favor those.

      If you’re going to avoid gluten or wheat and remain vegetarian, you might need to supplement. Wheat and beef supply taurine, which you might miss out on.

  2. Sherman says:

    I’m O negative. I love whole-wheat products. I don’t eat red meat. I do eat fish, all fruits and vegetables, leafy greens, and all legumes including lentils. I stick mostly to olive oil, and a bit of canola. I do take many supplements. I’m in excellent health, even though I’m overweight. I exercise daily, go on occasional 6-10 mile hikes. Please note that many studies show that overweight persone over 65 have a lower death rate than those of normal or below-normal weight. I think that blood-type diets are a theoretical construct that has little, if any, relation to reality.

  3. A nice summary!

    The link in the first source should not have an apostrophe in it. It’s just .

    Also, all oils should be cold pressed.

    And it’s important to avoid processed foods as much as possible, especially if you experience “symptoms” shortly after eating such as sniffles, headache, brain fog.

    I wish I’d known about the Blood Type Diet at least 30 years ago!

  4. Ermioni Nikoltsiou says:

    very good -blood type diet.

  5. Pensavo di mettere il vostro logo sul nostro sito con il vostro link per dar modo ai nostri visitatori di conoscere il vostro blog. Cosa ne pensi?

  6. Thanks for the marvelous posting! I definitely enjoyed reading
    it, you happen to be a great author. I will ensure that I bookmark your blog
    and may come back at some point. I want to encourage you to definitely continue your great work, have a nice day!

  7. They have many important functions in the body, including control of inflammatory
    responses. Pleurisy can be generated by a variety of infectious and non-infectious
    causes. It may mean you may have to alter your sex life or work on it a
    bit more.

    My homepage prevent lupus (