Marks Daily Apple
Serving up health and fitness insights (daily, of course) with a side of irreverence.
29 May

Does Your Blood Type Determine Your Optimal Diet?

BloodI get a lot of emails about the “Eat Right For Your Type” diet, also known as the blood type diet, which asserts that specific optimal diets exist for each blood type. In this post, I’ll take a look at whether there’s anything to this idea, and whether you should change the way you’re eating based on whether you’re Type O, A, B or AB.

The proposed diets all tend to be pretty decent, whole foods-based ways of eating, and they’re all better than the standard American diet of industrial processed junk, but differences do exist. Here’s the basic breakdown of all four blood type diets:

Type O (PDF): The “original” blood type and the oldest one, proponents claim it evolved among hunter-gatherers in response to their (Primal) diet of animals and plants. People with this blood type do best on meat, fish, and certain fruits and vegetables while limiting starches and omitting grains (especially wheat), beans, legumes, and dairy. It’s pretty much a strict paleo approach.

Type A (PDF): The agricultural blood type, proponents claim it arose after the advent of agriculture. People with this blood type do best on vegetables, fruits, grains, beans, legumes, and limited fish. They should avoid meat, wheat, and dairy. It’s basically a vegetarian diet.

Type B (PDF): The “nomad” type, proponents claim it arose amongst pastoralists raising animals for meat and milk. People with this blood type do best with lamb, mutton, rabbit, and most other meats (except for chicken and pork), dairy, beans, and vegetables. They should avoid wheat, olives, tomatoes, and corn.

Type AB (PDF): The “generalist” blood type. People with this blood type can eat many meats, some seafood, dairy, beans, grains, and fruit, but they should limit kidney beans, lima beans, seeds, corn, beef, chicken, and buckwheat.

I see a few things wrong with their reasoning:

First, they’ve got the anthropology all mixed up. Type O blood isn’t the oldest blood type, nor was it formed by human dietary patterns. The most recent research has found that Types A, B, and O arose almost 20 million years ago in a far-off ancestor common to humans and other primates – long before humans hunted, gathered, farmed, domesticated animals, or even existed. In fact, if anything, it’s type A blood that’s the oldest.

Second, if type A blood arose in response to agriculture, why would the Australian aboriginal diet of meat, marrow, and foraged plant foods, or the Sami diet of reindeer blood, meat, and milk and fatty fish both give rise to a preponderance of type A blood carriers? Type A is supposed to be founded on agriculture – grains, beans, with very little animal products. If a high-animal foods diet selects against type A blood, why does it flourish in these populations?

Third, the justification given for eliminating certain foods from these diets is that the lectins found in them trigger agglutination (clumping) of the red blood cells when consumed by someone with the wrong blood type. So, lectins found in olives are supposed to cause agglutination in Type As, lectins found in grains are supposed to cause agglutination in Type Os, and so on. Proponents claim that specific lectins are selective in their tendency to agglutinate – they interact differently with the various blood types. This supposed selective agglutination is the proximate arbiter of whether a food belongs in a particular blood type’s ideal diet or not, but it doesn’t even exist. The actual research suggests that lectin agglutination is non-selective with regard to blood type. If a particular lectin agglutinates, it generally agglutinates across all blood types. If a lectin is harmful to one blood type, it’s harmful to all.

That said, the blood type diet folks do highlight an interesting observation: the individual blood types are often associated with different rates of certain diseases.

Type Os have a curious relationship to certain infectious diseases. While those with type O blood are more resistant to contracting cholera infections, if they actually get infected, they’re more likely to have an extremely severe reaction. It protects you until you get cholera, after which it leaves you extremely vulnerable. The extreme virulence of cholera to this blood type may even explain the relative paucity of type Os in areas where cholera is common.

Type Os also are far more susceptible to ulcer, now known to be caused by infections from H. pylori bacteria. This is likely explained by the greater preponderance of “H. pylori receptors” in the guts of type O individuals.

Against other diseases, however, type O seems to be somewhat protective:

When compared to other blood types, type O is associated with lower rates of heart disease. The studies (comprising roughly 90,000 people) determined that 6.27% of the cardiovascular disease cases could be attributed to having a non-type O blood type.

Upon reviewing twelve separate studies, researchers determined that type O blood confers protection against pancreatic cancer. Type B was most strongly associated with pancreatic cancer, followed by types AB and A, respectively. Despite the results, “the mechanism by which these SNPs influence risk is unknown.” It could be that “these SNPs may act as markers of allelic variants in nearby genes, and the ABO antigens may not be directly involved in” the development of pancreatic cancer at all. Then, once a person has pancreatic cancer, type O confers a significant survival benefit over the other blood types. This may be explained by the observation in animal studies that the immune systems of types A and B seem to have a harder time at “noticing” and “destroying” cancer cells.

Type Os are also less likely to get gastric cancer, despite their increased susceptibility to H. pylori infections (usually a risk factor for gastric cancer).

These connections are worth looking into and deserve further study, certainly, but they have nothing to say about what diets work best with each blood type.

Obviously, I agree that certain kinds of dietary lectins are problematic, especially if they make it past the gut and into the blood stream. They’re a big reason why I avoid most grains, beans, and legumes – not only do they contain large numbers of lectins, but the lectins they have tend to be particularly proficient at disrupting and navigating the gut barrier. And yes, some people seem more sensitive to dietary lectins than others, but I see no evidence that a person’s lectin sensitivity – and thus ideal dietary composition – is determined by their blood type. It’s an attractive idea, the notion that we can determine someone’s optimal diet and offer them perfect health and protection from disease simply by checking their blood type. It’s just not a realistic one, according to the available evidence.

In the end – and this might be the most important part of this whole thing – the blood type diet “works” because it eliminates processed food regardless of blood type, removes wheat from the diets of people with blood types A, B, and O (which takes care of the vast majority of the population of the world), and recommends that most people (type O is the most common blood type) eat a diet based on meat and plants with little to no grains, beans, sugar,and legumes. I’m honestly not all surprised that so many people get great results.

What about you? Have you tried the blood type diet? Do you know anyone who’s tried it and had success – or failure? If so, what type were they?

Thanks for reading, folks!

You want comments? We got comments:

Imagine you’re George Clooney. Take a moment to admire your grooming and wit. Okay, now imagine someone walks up to you and asks, “What’s your name?” You say, “I’m George Clooney.” Or maybe you say, “I’m the Clooninator!” You don’t say “I’m George of George Clooney Sells Movies Blog” and you certainly don’t say, “I’m Clooney Weight Loss Plan”. So while spam is technically meat, it ain’t anywhere near Primal. Please nickname yourself something your friends would call you.

  1. several years ago I went to a bioentergenist who told me about the eat for your type book, which I purchased; while I don’t subscribe to the diet based on the book, what I found very interesting was most of the foods listed, which I should avoid, were foods that I was not eating anyway because I did not feel well after ingestion . .

    Carolyn wrote on May 31st, 2013
  2. I notice that three out of the four profiles suggest eliminating wheat. That seems like it would contribute a whole lot to successes, regardless of whether the rest of the science is baloney.

    Erin wrote on May 31st, 2013
  3. My question is I’m AB neg and I’ve been eating fairly strick paleo..95% for a year. I’ve gained gained 45 lbs in 10 months. What’s going on. Is paleo not for me.

    Richard wrote on May 31st, 2013
    • My first thought was “you are kidding yourself” I find it hard to believe anyone would gain 45lb from eating paleo, but then when I thought about it it seems to me that there are several pitfalls for the newbie. Its hard to say without knowing what you are eating in a day but here are some common errors.
      First portion size does matter. Check how much protein you are eating – it may be too much
      Are you eating a lot of fruit, nuts or dairy? cut them out for a couple of weeks and see how you go. ditto root vegetables.
      Are you eating processed meats? Sausages ham jerky salamis ets. These can contain a lot of sugar used in the processing.
      Are you still drinking alcohol? this can affect fat burning
      Are you eating high protein bars or shakes. Cut them out – artificial sweeteners can play havoc with your metabolism.
      What are you 5% non paleo foods? If you are ‘good’ all day and then eat a bar of chocolate every night then you are kidding yourself!
      Lastly some people are more carbohydrate sensitive than others. Mark’s “sweet spot” of 150g carbs for effortless weight maintenance would see me piling on the weight. I do better on 50g a day. You should investigate low carb eating and tweak your diet and see if this helps

      Good Luck!

      Anakei wrote on June 1st, 2013
      • Ok first not a paleo newbie second my meals look like this….. 2 eggs…breakfast….lunch chicken broccoli… Dinner is meat and veggies. pretty basic. I drink tea and water. I use butter and spices for flavor.
        Thanks in advance.
        I don’t like fruit so its pretty rare for me to eat it same with nuts

        Richard wrote on June 3rd, 2013
    • You might try some on the articles on this link, there are several about why you might not be loosing weight after going primal.

      b2curious wrote on June 3rd, 2013
  4. This is very interesting. I am A+ and for years followed the weight watchers diet – very little red meat, low fat everything,plenty of legumes, and vegetables and allowed quantities of bread and potatoes etc, basically I was following the diet recommended for A blood type. I struggled with my weight, was obsessed by food all the time, felt tired and hungry all the time and suffered from roller coaster blood sugar highs and lows and major cravings, but ,hey, I was eating healthily!. As I grew older it became more and more difficult to stick to the ‘healthy’ eating plan and my weight crept up as I started to binge to satisfy cravings and just to get a feeling of not starving all the time. One day in Borders I browsed through a book outlined the basics of low carbohydrate eating and described my food/eating problems to a T. This started me on Atkins/low carb and now Paleo ( the complete opposite of A type eating) and all the above symptoms have disappeared. After a year of trial and error I find I do best on a low carbohydrate (not more that 50g per day) with no grains, or legumes, though I do eat limited dairy. I’m never hungry, don’t need to snack, I have lost 5 kilos and have abundant energy. Had I stayed on the diet ‘suitable’ for my blood type I have no doubt I would now be fat, miserable and sick.

    Anna wrote on May 31st, 2013
  5. My blood type is C+, just barely above the average blood type.

    Kiran wrote on May 31st, 2013
  6. The Blood Type Diet worked well for me, basically because the type O diet is paleo/primal eating!!

    Jenny wrote on June 1st, 2013
  7. I was pretty skeptical about the blood type diet at first and although there is no solid evidence proving it, I seem to not agree with everything that is a no-no for O blood types. Beginning a primal diet I could eat anything really, but as time progresses I began to feel sick after eating eggs, pork, avocados, tomatoes etc. All things that are not good for the O blood type. So who knows, maybe there’s some truth in there somewhere.

    Tom E. wrote on June 1st, 2013
  8. A friend (O type) and I tried this diet a few years ago before I’d even heard of celiac or paleo or anything at all like that, when I started having my first serious issues with IBS and massive weight gain. Since my mother had always told me I am A+, I went with the grains and less meat, and my friend did the more or less paleo option. Unfortunately, I only found out a few months ago that I am actually O type.

    I remember many conversations that started with my telling her I wish I could do her diet, that I just felt like mine is wrong for me. Indeed, I eventually abandoned mine and went for a strict macrobiotic diet and Atkins. Meanwhile she continued on the O diet and did really really well.

    Alex wrote on June 2nd, 2013
  9. In the old days – before people knew which blood type they were – they just had to guess; I’ll presume I’m B+ and eat according to that – imagine all the confusion back then!

    zikzak wrote on June 2nd, 2013
  10. Ive tried and tested the blood type eating plan… As a type O I thrived on it for obvious reasons.. I was a real believer in it until I understood more about evolution and anthropology then its philosophy never really jelled with me or made sense…. One thing I did find interesting is that some of the foods like the particularly nuts were things I naturally craved… and certain foods on the not to eat list I was already naturally avoiding as the didnt agree with me..,…. any way its all grok style these days which is serving me just fine!

    Jason Rice wrote on June 2nd, 2013
  11. This is about the only thing I have ever disagreed with Mark on. I used to feel the same as him about the blood type diet, until after my own challenge with my health the past 2 years, and discovering what worked & what didn’t. For years, patients asked me about the blood type diet. I would tell them just follow a “healthy” diet with organic food. I finally read the book “Eat Right 4 Your Type”, studying Dr. Peter D’Adamo’s work at the urging of my father. His health made a huge turn-around & was having good success with controlling his digestive & ulcer issues with the diet. Scientifically, it made complete sense. The blood type diet is based on science (however, Dr. D’Adamo’s origins, IMO aren’t based on science, but merely observation & opinion. I don’t agree with that part).

    Me, being blood type A, followed a different pattern. After years of eating what I thought was good (mostly paleo), enjoying good health, then seemingly to go downhill suddenly, I followed the blood type recommendations strictly. It made all the difference in the world. And the first time in my life, I was able to loose weight, effortless (after struggling with this for years, even while following a “healthy” diet & exercise).

    I have noticed people who disparage or put down the validity of the blood type diet are those who have not read the book & have no scientific understanding of the basis of the diet. Their comments are made out of ignorance. I am sure Mark has studied the diet though before blogging on it. He does make some good points. However, Dr. Peter D’Adamo, the author of the diet, has done extensive research on blood types & diet, going far beyond basic scientific studies, mostly likely the ones Mark is referring to. Dr. Peter D’Adamo is the world’s foremost expert on the subject. He has done decades of research & work on the topic. He is far more qualified to make the recommendations he does than anyone else.

    The blood type diet is scientifically based, sound & it works. Marks conclusions are too simplified to be taken scientifically.

    With all that said, I appreciate Mark’s opinion, as well as his diligence in freely sharing with all of us his knowledge & expertise. He is truly a remarkable person.

    Dr. Sara Chase wrote on June 2nd, 2013
  12. I spent 5 years in and out of several doctors offices, gastroenterology offices, ER’s, and urgent cares. All of my tests came back normal. Everything they told me to do failed. My body finally reached a point of constant pain. My dad flew me out to AZ to see doctors by him. When I arrived he suggested that I try the Blood Type Diet just for the heck of it. One week later ALL of my problems were gone! I ended up not even seeing doctors by him since the diet was working so well. I’ve now been on the diet for over 3 years. I deviate occasionally…esp for potatoes and peppers that aren’t good for type A. However, I always pay the consequences. I’ve learned that different foods affect me in so many different ways. My favorite learning experience is that if I know I’m going to deviate from the diet, I load up on highly beneficial foods before and after and the consequences are significantly reduced! Considering that I’m in some form of pain and/or discomfort every time I deviate from the diet I will most likely be sticking with it for the rest of my life. It feels so amazing to no longer be afraid to eat and to be able to control the pain and discomfort!

    Tara wrote on June 3rd, 2013
  13. Any diet that would have been impossible to follow for the majority of human history and that requires blood typing and other tests is highly suspect to me. As is any diet that requires counting calories, taking careful measurements of resting metabolic rate, etc. Making people believe that they need to be treated like science experiments in order to be healthy is problematic, makes them dependent on somebody else’s judgement, and may cause them to ignore clear signals that their own body is giving them (“I’m hungry all the time.” “I feel really tired.” “When I eat X my stomach hurts, but it’s in the diet so it must be good for me.” “I constantly crave meat but I know it’s bad for me.”) that something is wrong. I’ve unfortunately seen it even among my former coworkers at the health food store, who should have known better.

    Sarah wrote on June 4th, 2013
  14. I’m actually doing D’Adamo’s Genotype Diet, an update of his blood type diet, after being paleo for 3 years, doing the bone broth, organ meats, fatty cuts, grass fed, what have you. I was seriously invested in paleo and learned everything I could but it wasn’t working and my health got much worse than it had been before paleo. My health still isn’t perfect, but I’m way healthier and happier now being mostly vegetarian (I eat lots of fish and eggs) than I was on paleo. I’m glad I did paleo, though, because I have still held on to a lot of what I learned about how to live.

    Elissa wrote on June 4th, 2013
  15. I have followed the blood type diet and still do to about 90%.
    My results where absolutely incredible.
    Everything changed for me to the better.
    I tested around with food after a year following it pretty strict and I was amazed about the effect by the ‘to avoid’ foods.
    I am blood type A and I reckon anybody following that diet will have a similar effect though.
    Since many people watched me transform over a short time I have guided years ago about 20 people with the blood type diet as well.
    Most people had seen great effects after a short time but ALL blood type A’s had the most profound change and transformation within 2-3 weeks.
    I reckon it is worth to try it out and see for yourself.
    If you really want to know all details about the diet tailored for you personal than you should go to a nutritionist who offers food related blood analysis.

    Cosmix wrote on June 6th, 2013
  16. I did try the blood-type diet for a while (I’m O type) but I found it a little complicated and inconvenient to follow at that point, simply because it opens too much restrictions overall: even among spices, vegetables, meat, fish and fruit…

    Rosa wrote on June 7th, 2013
  17. I did try the blood-type diet for a while (I’m O type) but I found it a little complicated and inconvenient to follow at that point, simply because it opens too much restrictions overall: even among spices, vegetables, meat, fish and fruit and so on…

    Rosa wrote on June 7th, 2013
  18. I did try the blood-type diet (I’m O type) for a while but I found it a little too complicated, simply because it opened too much restrictions overall: even among spices, fruit, vegetables, meat, fish, and son on (I’m Paleo now)…

    Rosa wrote on June 7th, 2013
  19. I think that BTD attempts to deal with the two major, obvious challenges to the calories in/calories out mantra.

    1) There are people who are of ideal weight, have strength and stamina, plenty of energy, sleep well, etc etc and so forth – and have these markers of good health in nearly every pattern of dietary observance a person can name.

    2) The human gut is the next unexplored frontier.

    Blood type, secretor status, and genotype all attempt to address these factors. Somewhat less efficiently than DNA typing the bugs living in our gut but still trying to address these challenges.

    Why DO some people thrive on a more or less vegetarian diet while others get terribly ill? Why do some people experience great relief from illness and inflammation on an animals and fat diet, while others find they become far less healthy?

    eema.gray wrote on June 7th, 2013
  20. I did try the blood-type diet (I’m O type) but I quit on it, simply because it opened too much specific restrictions (a little too complicated), even among fruit,
    vegetables, meat, fish, spices and so on, so nowadays I’m Paleo, which was a very natural transition from one to another :)

    Rosa wrote on June 8th, 2013
  21. HI,
    I followed the bood group diet meticulously for just over a year. My symptoms were a deep tiredness almost in the bones that had not responded to sleeping and resting and any type of therapy.
    Within 2 weeks of the diet (A blood group) I already felt significantly different. So I stayed on it. I also agree with the types of exercise suggested, the milder types, Yoga and meditation. I used to go jogging with an O group friend. I was wel done after one round and they needed 4 to get the same results!.
    I recently tried to eat a more O group diet and it does not agree with my body. It makes me tired and heavey.

    Nemi wrote on June 8th, 2013
  22. Before the discovery of DNA, scientists used blood proteins (the human blood group systems) to study human genetic variation. Research by Ludwik and Hanka Herschfeld during World War I found that the incidence of blood groups A and B differed by region; for example, among Europeans 15 percent were group

    Excerpted from Wikipedia

    “B and 40 percent group A. Eastern Europeans and Russians had a higher incidence of group B; people from India had the greatest incidence. The Herschfelds concluded that humans comprised two “biochemical races”, originating separately. It was hypothesized that these two races later mixed, resulting in the patterns of groups A and B. This was one of the first theories of racial differences to include the idea that human variation did not correlate with genetic variation. It was expected that groups with similar proportions of blood groups would be more closely related, but instead it was often found that groups separated by great distances (such as those from Madagascar and Russia), had similar incidences.[2] Researchers currently use genetic testing, which may involve hundreds (or thousands) of genetic markers or the entire genome.”

    Dr. Michal wrote on June 9th, 2013
  23. My cousin and I are both B+. She has been on the blood type diet for about 3 years and dropped 40 pounds. I tried explaining to her that she lost the weight because she gave up all processed foods and started “eating clean” but for some reason she still believes it’s because of the blood type diet. Can’t get through to her. Oh well… at least she’s eating healthfully now. :)

    Darlene wrote on June 11th, 2013
  24. I did ER4YT and followed it religiously for about 9 months. I’m O and I felt the most amazing I’ve ever felt in my life. I fell off due to life pressures and travel. I’m now recently diagnosed with endometriosis and have been feeling like crap for such a long time, and was in a vicsious cycle of eating crap and craving it and so on. I knew I needed to get back on it, and when I talked to a friend, he pointed me to this website. I’m so excited to have this resource and to feel amazing again. It’s all so simple and just makes sense. Thanks you!

    Vari wrote on June 13th, 2013
  25. I am type A, and the vegetarian way of eating does not work for me. Grains make me bloated and give me stomach pain, as does too much dairy. Fat, and lot’s of it, is what works for me! Coffee with heavy cream keeps me going for hours and I do not have to make breakfast!

    When I was on Atkins (about 8 years ago), I felt the best I had ever felt health wise, but I allowed myself to be derailed by people in my life telling me how bad “all that fat is”; I knew it wasn’t, but I hated having my co-workers staring and making the tsk tsk sounds at lunch. I lost weight, slowly and steadily, and felt good but still caved in to the masses.

    The best thing the government has ever done was made the announcement that as far a food plans go ONE SIZE DOES NOT FIT ALL, so at least now I can use that nugget when my (new) co-workers want to know why I only eat a meat patty at lunch lol.

    Mae wrote on June 30th, 2013
  26. Here’s a recent article on a study by Belgian researchers that say there’s no evidence on any health benefits with the BTD.

    Liz wrote on July 6th, 2013
  27. Quite a few comments on this one…. Dr. D’ Adamo’s anthropology can be questionable at times, but the blood type food values are ultimately determined by INDICAN testing (measuring the digestibility of a given food based on levels of rancidity specific to the ABO makeup in the gut). I have been following the ABO diet since it hit the NY TIMES best seller list back in the 90’s, and have had nothing but GREAT results. I’ve read the DADAMO and MDA books, and don’t see much difference between what they are both prescribing (sometimes, I will see a condemnation of a particular food on MDA, only to see an exception article later on (EX. RICE), which usually lines up with DADAMO’S original take.) I have a deep respect for both parties, who ultimately advocate the return to natural foods and healing. God Bless.

    CF wrote on July 10th, 2013
  28. Quote: “I have noticed people who disparage or put down the validity of the blood type diet are those who have not read the book & have no scientific understanding of the basis of the diet. Their comments are made out of ignorance.”

    That is so true, and so very sad.

    Like other doctors who have posted here, I too have informally asked my patients over the years about their diets and what foods work best for them. I have invariably found that people who do best eating a lot of vegetables and not that much protein (especially not caring for red meat very much) are always blood type As. They also prefer yoga and other lower intensity exercise.

    Blood type Os however always report that they do best with a lot of meat/protein and regular intense exercise. I can’t even tell you how many type Os I have known who tried a vegetarian diet because they thought it was “healthy”, and it ruined their health.

    I have read Dr. D’Adamo’s books, and further looked at a great deal of his scientific research which is extensive and very sound in my opinion. Some of the belligerent comments here likening it to astrology are downright offensive considering the years of research that has gone into the work, and how much it has helped people.

    Part of the problem though is that the Type A plan that was described in the original book back in the 1990s did not take into consideration the Type A subgroup that was later found to need significantly more protein than other Type As.

    The Blood Type diet was further refined by taking into consideration Secretor versus Non-Secretor status. Knowing your Secretor status can result in significant refinements of the diet that will make it even more effective. For example, I am a Type O Non-Secretor, so avocado and coconut oil is fine for me, but an avoid for Type O secretors.

    Secretor/Non-secretor was discussed in D’Adamo’s later book “Live Right for Your Type”, which I think was released in or around 2007. If anyone would like to try the blood type diet, it is very worthwhile to order the secretor test.

    The diet recommendations can be even further personalized for the individual with the SWAMI software and GenoType testing. I haven’t done this yet, but plan to.

    I can understand that people posting here are very attached to the idea of Paleo for everyone, but I can tell you from practice that it is not quite that simple. I’m a type O, so I am much closer to Paleo than vegetarian/vegan… but there is so much more to optimizing one’s diet in a way that truly fits the individual. In my experience, Dr. D’Adamo’s program is the closest you can get to personalizing a diet program for someone. (Although I suppose there are rare individuals who have chronic food allergies that remain even with strict BTD compliance – so they may need even more customization.)

    By the way, I took a look at the Type O PDF listed in the article above, and saw that it was compiled by someone other than Dr. D’Adamo and it doesn’t take into consideration Secretor/Non-Secretor status. (Or Dr. D’Adamo’s GenoType groupings.)

    If anyone is reading this and wants to try the blood type diet, they can order a home blood test kit (if they don’t know their blood type) and the saliva secretor test. Then you can just check the database on to see which foods are beneficial, neutral or avoids. For anyone who is having major health challenges, it would probably be well worth it.

    Dr. Marie wrote on August 5th, 2013
  29. Here are my facts, since we seem to be compiling a nice database of anecdotal evidence here, are as follows:

    My dad is o+, my mom is B-, I have one sister who is O-, and one is B+. I have never known my blood type and every test I have had for it has been inconclusive. Dad and both of my sisters prefer a high-carb vegetarian diet with fish and do well on it. Dad and my type O sister like running excercise, but my other sister prefers weights. Mom exists solely on grain, potatoes, and dairy, with fatty meats sometimes. She does no excercise at all. Her health is surprisingly good.

    I gain weight and feel terrible if I eat either mom’s diet or dad’s diet. In fact, I did nothing but gain weight all my childhood. When I started to cook for myself, I tried many diets and gained weight on all of them. Eventually, my doctor told me to try keeping a log of foods and how they made me feel. Eating foods that make me feel good has helped me start losing weight. Not huge amounts, but 40 pounds in two years. Here are some of my results:

    Happy foods: wheat, spelt, spinach, cucumbers, tomatoes, chicken, beef, pork, Lima beans, kidney beans, butter beans, hummus, lime, milk, yogurt, wasabi, seaweed, mushrooms, yellow squash, dark chocolate, onion, cabbage, pickles

    Misery food: sugar, honey, green or wax beans, broccoli, garlic, rice, cheese, oats, fish, seafood, soy, Brussels sprouts, most fruit, lemon, corn, fatty meats, eggs

    I have noticed difficulty digesting fats in general. For excercise, I prefer swimming, aerobics, walking, or an orbital stepper. I actually get weaker when I try weight lifting.

    So, what blood type am I? You’re welcome to speculate. i doubt I’ll ever know, and I’m not sure it matters. By keeping a simple log, I got a diet that works and it cost me nothing.

    P. J. Beach wrote on August 9th, 2013
  30. It seems there is no way to edit a post, but I can’t believe I forgot potatoes. Nothing makes me suffer more than garlic, but potatoes come close.

    P. J. Beach wrote on August 9th, 2013
  31. I started the er4yt eating plan almost a year ago. I began by adding in the “beneficials”, leaning on the positive aspects of the plan and I have to say the pain in my knees was the first to go! What a great side effect. I am so happy to be going up and down stairs like a grown-up again! It’s working for me, I’m happy about that.

    Margaret wrote on August 13th, 2013
  32. I have been on the blood type diet twice and done very well with it! The paleo diet conflicts somewhat with the A blood type, but from my own reading of the blood type diet and reading some of the comments above , the blood type diet works, but you still need to find out which foods from each group work best for you. Yes, we are a high-plant based group and “vegetarian”, but we are only cutting out red meat and shell-fish and some KINDS of fish and some KINDS of items from other food groups – not the whole lot, in most cases. I am lactose intolerant and get constipated from wheat. Tomatoes and/or kidneys (chili) gives me Restless Leg Syndrome. Those are things I know bother me, so if I choose to cheat occasionally and eat them, I have nobody to blame but myself if I get a flare-up. Potatoes and wheat sometimes give me chest pain – another reason to avoid.

    Regarding Canadian Blood Services (since Red Cross no longer looks after blood), I once read a hand-out there that actually talked about each blood type, the type of exercise we should do (just at the blood type book does) and that A’s are vegetarians. I don’t know if the got their info from the good doctor, but it’s all about chemistry.

    I’ve lost a huge amount of weight on the blood type diet and don’t find it that difficult to do when eating at home. Our family of four is all A, so it’s not a big issue. Hubby refuses to give up his cheeseburgers and finds they balance his blood sugar (Type 2), but he has to buy them. He will eat what I cook unless it’s got tofu in it, and it’s rare that I use it.

    Incidentally, when I started my blood type diet in January and did a detox kit for the first 10 days (using blood type A foods only), I lost around 10 lbs., but in the first three weeks (cutting out ALL sugar, dairy and wheat) I lost six (6) inches off my waist in THREE WEEKS! Yes, the Paleo diet likely could have done that, too, but historically – when I eat out – I buy fish and chicken. Maybe it’s like out “colours”: We naturally choose what our body wants – when we’re paying attention to how it reacts to certain foods.

    Tina wrote on August 22nd, 2013
  33. I got interested in this diet several months ago because of our family’s history with heart attacks. After 3 months on this diet ( type A ) my cholesterol dropped 41 points and triglycerides dropped 100 points , both are below the normal targets of 200 and 150 ( I think those are correct numbers ) . Weight has never been an issue for me as I am an avid bike rider ( 100-200 miles per week ) but I still have dropped 5-8 lbs on this diet. Do I enjoy this diet ? Not really but the bottom line is my body does not process meat efficiently, it just doesn’t. I have adapted and accepted this reality. If your reading this have a burger for me 😢

    John wrote on September 14th, 2013
  34. I should start off by stating that I have type 1 diabetes and Hashimotos disease- been low carb for yrs ( 30grams or less a day) I felt better because my blood sugar control was amazing, but did not feel good enough. I went off all packaged foods, grain, and dairy….better, but not much better. At that point I was eating a lot of greens, EVO, coconut oil( the holy grain for thyroid patients) peanuts, coconut flakes, almonds, meats were mostly poultry or pork ( I know what I was eating was very pure too). At this point both my husband and I decided to give he blood type diet a go! I am Type O-He is Type A. This made it more fun because his diet would be quite different than mine. I made the choice to really focus on the “healing” foods on my list and took out the forbidin coconut/peanuts That I used often and added pumpkin seeds and lots of red meat. My husband ate much lower fat-much higher carb and foods like pineapple, oatmeal, molassas and peanut was a staple-he has IBS and has has issues from almost birth. Our health issues fit our blood types too-Found that interesting. RESULTS after 1mth- I can honestly say I felt great-really. I swing between a siz 4 and 6 and always fight to keep weight off-that mth I was a 4 without fighting or swinging back and forth like most mths. I tried adding the coconut and peanuts back and felt bad again- I am going back to it as we speak-I tried more variety and it never works out. I don’t love red meat but my body really responds well to it. My husband lost weight and for the first time in his life was not running to the bathroom after eating. The pineapple really helped hid stomach. Interestingly, my husband has stomach issues when he follows a diet like mine. That is how it went for us! Just wanted to share!

    Angela wrote on September 18th, 2013
  35. Give me any person and put them on their blood type diet and see the shift in my friend need to look at the fact and results from an inspirational bloke who has devoted his life to helping people out of their misery..

    Dan wrote on September 20th, 2013
  36. Its the blood type diet that led me to a Paleo Diet Lifestyle!

    I’m an O non-secretor, and when I started following it with discipline I started having days of feeling better than I ever have in my entire life and I’m 33! 33 years of living in an ADHD, fog headed, anxious looping nightmare made me get there was something to the blood type thing for me. I’m a total nutrition and biochemistry nerd because of the challenges I’m working through which led me to further study… upgrading/integrating Paleo.

    What Mark says makes sense! I like using the O blood type non-secretor diet recommendations because they complement and integrate with Paleo from the O blood type perspective. I also lean more towards the Paleo based approach because I’ve gotten even better since starting to integrate it in combination with medical testing and working with an ND. It also just feels best for me and is better researched in certain Paleo tribes. This article is a great example!

    I’m a huge fan of solid scientific research that backs up experience and intuition. It is my truth when you put these things together you really have something real!

    Ian wrote on September 23rd, 2013
  37. A lot of flawed logic here and gross generalizations.

    type O wrote on September 26th, 2013
  38. I have been on the A type diet for 3 months, I have dropped 15 lbs. I am off my acid reflux meds. My IBS is gone and I really feel better. I am not a strict follower of the diet. I still need comfort food sometimes but have to take a Prilosec if I eat the no nos. Snacking is hard but I now make turkey jerky. It is getting easier to eat the real food everyday. Stay Healthy

    Chris wrote on October 5th, 2013
  39. Each new blood type through ‘evolution’ represents a genetic manipulation by our little grey friends from Zeta Reticuli who travelled 39.5 light years to accelerate our development here on earth. Otherwise we’d still be living in caves. Blood groups have nothing to do with diet: that’s just wishful thinking by the sick and those who have books to sell. There is NO scientific evidence for D’Adamo’s blood-group diet. Anecdotal tales relate improvement, sometimes, from following elements of it but that is just ‘a change being as good as a rest’. To eat healthily: eliminate grains, sugars (except raw honey), chemical pollutants, xeno-estrogens and GMO. People are lazy and always want a quick fix; the blood-typing diet is not it.

    Trevor wrote on October 9th, 2013
  40. I would love to hear from more B’s that have tried this “diet”. I find it interesting that the book suggests that us B’s have issues with immune diseases, which is true for me. In fact, most of what is said about type B’s is spot on for me. A couple of months ago, after being diagnosed with a second autoimmune disease, I made the decision to go gluten free. I’ve felt better, but still not feeling great. Continuing my search here to get to overall health and wellness…

    Kristy wrote on November 9th, 2013

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