Blood Type Diet Debunked

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Blood Type Diet Perceived as “Crass Fraud”

It was Adolf Hitler who coined a propaganda technique he called, “The Big Lie,” arguing that people may be more likely to believe colossal untruths, because they would not believe that others could have the impudence to distort the truth so infamously, so in the big lie there is always a certain force of credibility.

Dr. Peter D’Adamo’s book Eat Right for Your Type makes the astounding claim that people with different blood types should eat different foods. Type O’s, for example, are supposed to be like the hunter and eat a lot of meat, whereas type A’s are supposed to eat less. A 2013 systematic review of the evidence supporting blood type diets was published in one of the world’s most prestigious nutrition journals. The researchers didn’t find any.

The researchers sifted through over a thousand papers that might shed some light on the issue, and none of the studies showed an association between blood type diets and health-related outcomes. They conclude that “there is currently no evidence that an adherence to blood type diets will provide health benefits, despite the substantial presence and perseverance of blood type diets within the health industry.”

Ten years earlier, the Journal of the Norwegian Medical Association released a number of papers that came out of a day-long scientific seminar held by the Norwegian Society for Nutrition. 40,000 copies of the Eat Right for Your Type had been sold in Norway, and so the researchers sought to determine whether blood type diets were visionary science or nonsense. They also concluded that they are nonsense.

The author of the blood type diet book responded to the review on his website, saying that “there is good science behind the blood type diet, just like there was good science behind Einstein’s mathematical calculations.” He says that if blood type diets were just tested in the right way, like  Einstein’s E=MC2, he would be vindicated. The reason we don’t see any studies on blood types and nutrition, he complains, is “because of little interest and available money.” But he’s sold more than seven million books. Why doesn’t he fund his own studies? That’s what the Atkins Corporation did.

In fact, he has! In 1996, he wrote, “I am beginning the eighth year of a ten year trial on reproductive cancers, using the Blood Type Diets … By the time I release the results in another 2 years, I expect to make it scientifically demonstrable that the Blood Type Diet plays a role in cancer remission.” OK, so that would be 1998. The results? Still not released, sixteen years later.

Good tactic, though, saying you’re just about to publish a study and banking that nobody would actually follow up. So in his sequel, he said he was currently conducting a “twelve-week randomized, double-blind, controlled trial implementing the Blood Type Diet, to determine its effects on the outcomes of patients with rheumatoid arthritis.” (See my video Blood Type Diet Debunked). That was ten years ago.

As my Norwegian colleague bemoaned, “it is difficult not to perceive the whole thing as a crass fraud.”

So rarely are popular press diet books afforded such fact-checking. Kudos to these researchers. If only we had this 13 years ago when the book was on the bestseller list!

I have a few videos on popular diets, such as:

I also wrote a book about low-carb diets, which is now available free online full-text at

Unfortunately, nutrition illiteracy is not just a problem among the public, but among the medical profession:

-Michael Greger, M.D.

PS: If you haven’t yet, you can subscribe to my videos for free by clicking here and watch my full 2012 – 2015 presentations Uprooting the Leading Causes of Death, More than an Apple a Day, From Table to Able, and Food as Medicine.


Michael Greger M.D., FACLM

Michael Greger, M.D. FACLM, is a physician, New York Times bestselling author, and internationally recognized professional speaker on a number of important public health issues. Dr. Greger has lectured at the Conference on World Affairs, the National Institutes of Health, and the International Bird Flu Summit, testified before Congress, appeared on The Dr. Oz Show and The Colbert Report, and was invited as an expert witness in defense of Oprah Winfrey at the infamous "meat defamation" trial.

107 responses to “Blood Type Diet Perceived as “Crass Fraud”

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  1. It is unfortunate that these fad diet books can get published with no legitimate research to validate the recommendations! It just adds to the confusion and gives the people who are resistant to change a crutch.

  2. I would say that most people aren’t “resistant to change” but, when looking for change, are lured by the latest publicized offerings. So many folks have no idea how to critique a new fad; they go with what the ads say or what Dr. Oz says or some worker in a health food store hands them.

  3. jaja.. my philosophy is “I AM REAL NOW” …started becoming real…i became a Pescatarian…and I can not kill any fish anymore… therefore, I AM VEGAN! [live &learn]

  4. The problem with the blood type diet is that it assumes that there is something about the blood type that determines everything else about the person.

    I don’t fault the guy for writing the book. I fault everyone else for not doing any critical thinking about the matter.

    1. “I don’t fault the guy for writing the book.”


      You don’t fault someone for spreading bad information that is not backed by science?

      “I fault everyone else for not doing any critical thinking about the matter.”

      So why does the author not get the same judgement? He believed what is not true which means that it is clear that research was either lacking or non-existent for the book.

      1. Because it is standard operating procedure for people to have ideas that they think have value and for other people to test those ideas.

            1. Dude,

              You are expecting readers of a book to research what a book says and then challenge the authors. You are implying that when people read books that they should take a scientific approach to it.

              It is not reasonable that anything beyond a small minority of people do this. I do and I am sure you do. But I would never project that onto others. There is some assumptions that are made, although often incorrectly, that a book that is filled with apparent facts (though the blood type diet is clearly misleading) is well researched. How much time do you think people are supposed to have outside of everyday life and then you want to add they have to research everything that they read?

              So the expectation is that people use some “standard operating procedure” that I have never heard of so I would love to see where you get the idea that what you think is posted somewhere for all to see or taught or whatever the access to this process is so free and well known. If people ran their lives like this one could never get through a BA or BS in four years; an MA or MS in five to six, and forget a PhD. You’d be spending time challenging everything you encountered. You have to have some assumptions that people with credentials, in the blood type diet’s case the dude was a homeopath but you also have people like Dr. Peter J. D’Adamo who are also behind the BTD. With homeopathy and also a medical doctor that ends up being more than enough for people.

              I guess that the world should stop so we can constantly question what we think we know and what we are told rather than putting a little faith that sometimes what we are told is accurate. With the BTD, I never bought into it but I can see some people did. There are doctors involved in the diet, studies that make claims that some readers have no idea how to debunk and not everyone has the tool set to even full absorb what a study would be telling them through the data.

              Again, how do you still blame the people that read the book rather than those who wrote it? Shouldn’t the author of the book and the people behind the diet be held to the same standard? Clearly they either 1) didn’t follow the standard operational procedure or 2) understand the research that they did or 3) intentionally lied. Yet it is the people that follow the diet who are at fault for not challenging or taking time to research and refute a diet that has some medical professionals behind it.

              I also didn’t say you sound smart. I said that it appears that you are trying to sound smart.

              1. I read books all the time and then experiment on myself. Those people who read his book could easily have done the same thing. They could also have read counter ideas and noticed that the theory was full of holes.

                1. I think peoples who comment negative haven’t enough experiment yet… I am the living prove of this science.. I already take 9years experiment for blood type diet.. And in 7years i practice to train and make people well with blood type diet,even with my own children and family,and now people mutated so must have more specific test it called SWAMI test,the problem was only people with hi commitment can achieve the most excellent result, it is scientifically proven who said it wasn’t it is surely lie and stupid in life and also didnt have any commitment in him or herself, and also now blood type diet is already improve to genotype and SWAMi because people is mutating and divided to about minimum 200 type.. Nowadays people with the same bloodtype can become different body,health,etc and because the mother nutrition and stress of the baby inside when carrying the person is all the reason to make what type of person after birth.. Thanks.. If anyone has a question you can ask me because i already practice in daily life to hundreds of people around me and the other city,also test ir with karada scan omron machine to test wheter a person avoid the avoid food or eat the avoid food or eat the beneficil food it can be peobe by karada scan omron machine also with medical check up or laboratoriun test,and it is tiring because the most challenging is to control eating habbit and they all who didnt fit the profile that can be succeed also make negative comment because they cannot control their own eating behaviour and blame others for it instead of looking inside their own mind and mistakes… It is the easiest thing to do i guess so… Just read untill finished all dr peter d adamo have written so you all will understand that he is a brilliant man and genius in homeopath also you dont need to pay alot of money to become healthy for that.. But people mutate that is the problem not fit anymore only with bloodtype diet you must check what type are you now with the newest SWAMI around.. Bloodtype diet is the cheapest and easiest to do,but if you want the precise test you must do the higher one that is SWAMI test for sure.. The author surely brilliant and i believe not a person knowing all about helth because he is not God, God is the most brilliant,unique person,i surely be interested to ask Him after this life end because everything he creating is very amazing for me and most people who notice what God create will be same as me.. Wondering how He createf everything so beautiful,perfect and detail…but surely peter d adamo is the most brilliant man for homeopath around in this time.. Thanks

            2. It works by someone proposing (and generally with some evidence to back it up) a hypothesis in a scientific journal or at a scientific conference. The subsequent testing is then done partially by the original proposer and partially by their well-qualified colleagues. That is fundamentally different from putting something out to what amounts to a popular vote by laypeople who generally have neither the training nor the resources to meaningfully validate the claims.

              1. There is no law saying that someone can’t publish a book. But the theory in the book should be tested by others, including individuals. The peer review process does not work very well for paradigm shifting ideas. Alfred Wegener had a very negative peer review for 50 years until pictures by the US Navy of the floor of the Atlantic Ocean proved that the continents actually did drift. I know that the official peer review process is supposed to work a certain way, all unbiased and such, but that is NOT how it works in practice.

                1. I’m not sure where the law thing came from; no one claimed that it was illegal for the book to be published.

                  Again, the vast majority of the target audience have neither the means nor the wherewithal to test the hypothesis presented in the book (which, incidentally, doesn’t present it as a hypothesis but with assertion of fact – a very unscientific thing to do). I don’t know about you, but I certainly don’t have a handy lab at home where I can do my blood work every day to validate the claims in any such book.

                  As you seem to be having a hard time understanding this, let me provide an analogy:
                  If I say to a co-worker, “the program I just wrote is going to take over all your gadgets and extract your soul for tormenting, unless you do X”, they’ll know I’m just kidding (and what’s more, they’ll have the expertise to trivially prove that I’m talking rubbish); if I say the same thing to my child, then not only will they not be able to prove my claim wrong, but they’ll believe me because of my status in our relationship (D’Adamo’s “Dr” and “naturopathic physician” confers similar status at first glance, in many people’s eyes). In the case of the child, I’m certainly the evildoer and the child the innocent victim.


                  1. “the vast majority of the target audience have neither the means nor the wherewithal to test the hypothesis presented in the book” I don’t get it. EVERY SINGLE READER has the means to test the hypothesis. All that they need to do is try it. Then, if they are still unsure, they can try one or all of the other blood-type diets to see what happens. Does the rash go away? Does the insomnia go away? We don’t need very expensive ivory tower institutions to test things. We can and should test them ourselves.

                    1. Um, wut?

                      Oh, right: the placebo effect doesn’t exist, right?

                      See, if I believe strongly enough that a given thing (be it medicine or lifestyle change) that I believe I’m adopting will have a certain effect, then there’s a high likelihood that this effect ensues, whether or not I’m actually really adopting that thing. This is why you need to a) measure objectively, b) not know whether or not you’re adopting it, and c) be able to compare outcomes between applying the thing and not (i.e., the control). Experimenting on yourself without access to a lab makes (a) impossible, and (b) and (c) very hard (and impossible without help).

                      But maybe you have access to a helper and a lab, in which case you’re just making an error of entitlement, so let me assure you: the vast majority of people who have access to D’Adamo’s books, don’t have access to your enormous resources. I hope that’s clarified things for you.

                    2. Of course the placebo effect exists, but it doesn’t require $multimillion experiments to get around it. One first has to be aware of it. That is the first big step. And people must understand that if they let it influence their judgement that they will be paying for garbage that they don’t really need.

                      Most of my DIY healing compatriots are not even aware of it’s existence. Too bad. Most skeptopaths think that it is an insurmountable problem that can only be gotten around with $multimillion experiments, the experiments that only pharmaceutical companies can afford. This is simply not true.

                    3. A) I didn’t say $multimillion. Even a few thousand per year would be too much for me, and sufficient lab visits + helper to at least single-blind the experiment would cost at least that.

                      B) Regarding ability to consciously counteract the placebo effect: [citation needed].

                    4. B) me.

                      I think that it probably only works with people who have been practising absolute honestly for decades. It changes one’s character. I can’t be sure, because I do not know nor can I imagine any other way to be.

                    5. Wait, so you’re saying that because, based on your (by definition) subjective opinion you were able to consciously counteract the placebo effect, everyone can? That’s an even bolder statement.

                      But back to your original claim, blaming the victims: I’ve got a hypothesis (don’t worry; I researched it as well as D’Adamo researched his claim) that if you stand in front of a large microwave antenna while it’s active for 10 minutes per day, you will disease-proof yourself. I believe it is now your responsibility (oops, I meant “standard operating procedure”) to test it out.
                      (Everyone else reading: please don’t test this out. Or engage in victim-blaming.)

                    6. Actually, I didn’t say that. I said that perhaps most people couldn’t do it because they don’t practice absolute honesty. Most people can easily fool themselves because they spend so much time lying to everyone else. This would probably include you.

                    7. Thanks for keeping the conversation civil! I responded about the placebo effect above if interested. Appreciate your opinions and ability to have a conversation even if there is disagreement.

                    8. Um, wut?

                      Oh, right: the placebo effect doesn’t exist, right?

                      See, if I believe strongly enough that a given thing (be it medicine or lifestyle change) that I believe I’m adopting will have a certain effect, then there’s a high likelihood that this effect ensues, whether or not I’m actually really adopting that thing. This is why you need to a) measure objectively, b) not know whether or not you’re adopting it, and c) be able to compare outcomes between applying the thing and not (i.e., the control). Experimenting on yourself without access to a lab makes (a) impossible, and (b) and (c) very hard (and impossible without help).

                      But maybe you have access to a helper and a lab, in which case you’re just making an error of entitlement, so let me assure you: the vast majority of people who have access to D’Adamo’s books, don’t have access to your enormous resources. I hope that’s clarified things for you.

                2. “There is no law saying that someone can’t publish a book”

                  You seem to lack the ability to focus. that was never in question.

                  “But the theory in the book should be tested by others, including individuals”

                  And like many things, it was and has the backing of qualified people,that doesn’t make it right of course.

                  “Alfred Wegener had a very negative peer review for 50 years until pictures by the US Navy of the floor of the Atlantic Ocean proved that the continents actually did drift”

                  Ok but that is not what we are talking about. All that does is prove that you are wrong. You see, anyone who would have investigated what we knew about plate tectonics back in the day would have come to the conclusion that the idea at the time was right and that Wegener was wrong. Thus, anyone who did their research would have also come to the wrong conclusion. Just change plate tectonics and continental drift to the Blood Type Diet. Perhaps some readers did research and ran into the data that seemed to support it. Tie that into the idea that it is ok to rely on experts…except for you who probably googles anything that your doctor tells you.

                  “I know that the official peer review process is supposed to work a certain way”

                  More lack of focus. We were never talking about peer reviewed papers. You were blaming the readers of the book and not fellow experts in related fields.

                  Oi. Nice tap dance attempt.

                  1. And all of those people are wrong. They castigated Wegener for 50 years. Wegener’s evidence is still used today to support the theory of continental drift. There was nothing wrong with his evidence. It was perhaps not sufficient to convince everyone, but that does not make them right and him wrong. It just makes them lacking in imagination and the courage to look outside of the box.

                    1. My point is NOT that the people were wrong. My point is that at the time most of the science was that the evidence for plate tectonics was not there, thus if someone did their own research back then and came to the same conclusion as the science of the time they would still have been wrong even when they used your bullshit argument of following “standard operating procedure”.

                      Your inability to focus is astounding. I am going to assume that you know your first BS was wrong so you now keep trying to target other things. Why can’t people like you ever just say “Yeah, maybe I was wrong” or “I should have worded it like XYZ since I am clearly being misunderstood. Instead you argue your BS to the end even when it is obvious that the authors, which you hold blameless, are the ones that should have done more work in this topic and not the readers. There are times in life that one has to rely on experts and assume that the data is solid. Obviously this does not mean that experts are always right but you cannot expect everyone to live the life of a cynic.

                      Did you ever consider that maybe some of these folks used your method of validating the book? Self testing? Not that anecdotal evidence is proof of anything.

                    2. “evidence for plate tectonics was not there” The evidence was there. Just not enough to convince uptight people trying to defend their turf.

                    3. Erich von Daniken’s theory cannot be proven nor disproven until such time as UFOs are proven or disproven (sort of an impossibility, logically speaking.) So, for me, von Daniken’s theory is merely hot air. Wegener’s theory has been confirmed so many times that it is no longed doubted by anyone.

                      What was your point again?

                    4. The point was the venue chosen by Wegener to present his hypothesis to be tested? In a respected peer-reviewed journal or in the court of public opinion (popsci book 4 layppl)??

                    5. I have no idea what venue Wegener used. I do know that for paradigm shifting discoveries, the peer review process is flawed.

        1. Not sure why mjs responded so negatively, I totally get what you are saying and the fact that it is succinct has little to do with laziness.

          1. Thank you, crystal. Yes, insightfulness usually comes in very short sentences. Arnold: “I’ll be back”. Leonidas the Spartan: “Then we will fight in the shade.” Jesus: “Whatsoever you would have others do to you, do also to them.”. Descartes: “I think, therefore I am”. bachcole: “I experience, therefore I am”. McArthur: “I shall return.”.

    2. Hello Bachcole,
      Whilst I agree with what you are saying, you are more or less directing the comment from the perspective of scientific brains. Most people that buy and read this book will be looking for a quick fix to their everyday life and not necessarily want to research the findings. I on the other hand found this wonderful article that stated everything I pretty much thought when I first heard about a diet based off of blood type, mostly because I understand how our bodies work. But that is me, and you, and most everybody else that is on this thread. The real victims are the people that aren’t looking. Now you say to defer more blame towards the readers as opposed to the authors. That would be a legit case if the author had stated throughout his entire book that everything he was stating was still just a scientific theory with no proven outcomes whatsoever. But that wasn’t the case. Instead he presents his material as if it were iron clad proven scientific research. When people write this way they are doing so to deceive others. The author had found a way to bring about an already existing concern with people and presented a solution to said concern. His solution was a lie that he sold to millions of people and presented it in such a way that they thought it had to be true. So I myself do fault “the guy” for writing a book to purposely deceive people so that he could become rich. There is a moral issue with that and there should also be a criminal issue. Does the author work for CNN by chance? That would explain everything.

  5. Of all the fad diets this is probably the worst. Theoretically it makes absolutely no sense. ABO is one system – what about all the rest? Whats next: Eat right for your haircolor?

    1. I am not as familiar with Ayurvedic diets, but from what I gather there is far more research than this “blood type diet” not to mention Ayurveda is an ancient Indian practice. I would be very weary of some Ayurvedic medicines due to metals. I don’t think there is one “diet” and Western practitioners are definitely not as familiar with the 3 doshas and what constitutes a healthful diet. Also, yoga, meditation, etc., are all part of the healing process in Ayurveda, as lifestyle and diet are not separate. I hope others can weigh-in here. I’ll post more links and references as I find them. Thanks for bringing up this topic.

      1. “very weary [sic] of some”

        The error (feels like automatic spelling “correction”) may not be obvious to all:

  6. The idea that an individual ideal diet varies from person to person is valid given the immense variability in the human genome and thus phenotypes. The biomarker this author chose to identify genotypes and diet relationship does not appear valid but the concept does. We just have to move on and explore more predictive biomarkers.

    1. Exactly. The more we know, the more we know how little we know. Blood type may be a small pixel in
      the much larger picture.

  7. Truth tellers convey the facts, with measured caution.
    Liars know the facts, but willfully mislead.
    Bullshitters just make up any story to impress the people that pay money or take the time to listen to them.

  8. I think there is some research about people with type A blood having less stomach acid. Maybe they shouldn’t eat so much meat.

  9. Any doctor trying to heal, tries his best, and has NOTHING TO DO WITH HITLER, who was killing, not healing. Dr. Greger, please read more articles, in particular about works of Dr. William Donald Kelley, who established the basics of some protocols in medicine, which WORK IN CURING CANCER!! Just go to and educate yourself, on how blood type can and do affect our immune system, our digestion and consequently the healing.

    1. Thanks for the link! I think Dr. Greger was just referring to the fact this so-called “blood type diet” has been scientifically reviewed and it does not appear to hold any credibility. It’s a huge lie and folks should know about it! If anyone still wants to buy the book are try the diet I have no objections (we’re all adults and we make our own choices), but as a dietitian I would never recommend it. This reminds me of the Gerson diet, where studies also do not appear to hold credibility for its use.

      1. I am one of the thousands who purchased the book some years ago after seeing a tight correlation between the type O list and my own experience . I agree that the so-called science behind the blood type diet is a made up. But I think what Dr. D’Adamo tried to do was come up with a scientific sounding theory to back up what he saw happening in people. I have IBS and am gluten intolerant. And seeing his list for type Os for the first time, I immediately knew that there was something to it, as it agreed almost 100% with my own experience. But I know other people that are type O that have normal digestive systems that would totally laugh at the type O list as being totally irrelevant to them personally. As the type-O diet would suggest, eating meat does make my stomach feel better. But having moved to a FODMAP free, plant based diet has worked wonders for me. Now at age 60 I am in better health than I have been in years!

      2. Following the blood type diet – with a few exceptions – led to big improvements in health for me.
        I do not think this guy who came up with this has a bad or evil or selfish motivation. I think his
        intentions are good. And even if they were not, lots of people claim to have greatly benefited
        from following the blood type diet.

        1. Understood, but if folks have greatly benefited there is still no research to support whether or not the benefits were due to the “diet” or just random, like a placebo effect. Look, I am all for people feeling better so that’s good to hear something worked for you, but selling 7 million copies of a book with no science raises questions for medical and health professionals. I am unsure his intentions I think what matters is the research.

      3. That is a very flawed study in that “Gerson” video. Actually they did not follow the Gerson protocol in the study so Dr. Greger using the Gerson name in the video is misleading. Disappointing to say the least.

    2. I know about that one too… Gonzalez’ protocols are based on a combination of Dr Kelley and Gerson. I think anyone familiar with Gonzalez might not be so quick to dismiss the claims made by this author and it should be remembered that a lot of great scientists (not saying I think this blood type author will be one of them), have made some wrong conclusions, but have also contributed a lot. I just don’t know if villifying this author is completely justified as of yet… as much as I support the notion that anything other than plant based foods are merely optional or necessary when there is no other option.

  10. However, we must remember: absence of proof does not mean proof of absence.
    Just because we don’t find any proof of the blood-type association, it does not mean there is no such an association.

    1. When someone makes claims that their claims are a proven theory then they are responsible to provide evidence. In medical science anecdotal evidence and testimonials are NOT considered substantial evidence to support a claim. The burden of proof, the obligation to prove one’s assertion, is upon the claimant.
      After more than a two decades Peter D’Adamo’s has not provided sufficient (high level medical science) evidence to support his Blood Type claims.
      Re: “it does not mean there is no such an association” Sure and even a broken clock is correct for two minutes a day… but that is NOT valid proof of an accurate clock!

  11. All ‘modern medicine’ MD’s, R.D., etc, please watch : “The Truth about Cancer” by Ty Bollinger, and please inform yourself on real studies.

    1. I recall hearing Mr. Bollinger pushing something called “Cancer, Step Out of the Box” on the sort of radio station on which you might also hear ads for gold coins, survival foods, male-enhancement pills and whatnot.

  12. Mr./Mrs. kylemeister, please read carefully, Bollinger’s documentaries are about cancer and their title is, I’m repeating once again, in case you have trouble reading
    “The Truth About Cancer”.
    You can watch and listen to some of these series (11 altogether) on youtube, which to my knowledge is not a radio… Maybe there should an age limit for giving the comments here…

    1. Call me crazy, but I’m thinking his book (granted, I didn’t get the title exactly right) is probably basically similar to his youtube videos. This accountant/”cancer researcher” appears to me to be a pseudoscience/conspiracy-theory crank who associates with others of that sort.

      1. I just want to add that I think Ty Bollinger is genuinely on a mission to find a different solution than chemo/radiation to the cancer equation after losing his parents and many family members to it. He may not be “qualified” as a actual researcher, but strong passion that drives us can be very powerful motivator and agent of change, which is desperately needed in this area. I don’t think he has all the pieces for sure, and maybe even some questionable ones, but he is trying hard to reframe the puzzle, which is more than standard medicine is doing by continuing to perpetuate the same “nuke ’em all and check for survivors” approach, and nary a word about diet, prevention, or alternatives. I learned a lot from the series he put together, even if I thought some of his “experts” were less than stellar and missing some key issues…like a non animal based diet for starters! (But I also believe that each of us are the culmination of our ancestry, and just because I can’t handle any animal products for several reasons, doesn’t mean others may not have more leeway.) I firmly believe that plants heal and and about everything else is questionable, but our tolerance and the consequences vary…which is probably true about everything in our individual lives. Anyway, I definitely would not classify Mr Bollinger as a dangerous/distracting conspiracy theory crank, but a man on a hopeful mission who is reframing the outmoded attitudes and questionable practices of current treatments that have depressing overall “cure” rates, debilitating effects, and potential to cause the very disease it is trying to alleviate, and focusing on increasing the body’s natural ability to heal and maintain a disease free state. Though I know we need weapons to win a war, I also know that not having to start a war in the first place is the best answer to the conundrum. Only opinion, but I feel that his “Quest for the Cure” series has the potential to at least stimulate curiosity and help forward needed dialogue for other possible solutions, besides the obviously inadequate ones currently entrenched as dogma.

  13. A fool and their money are easily parted. Who buys these books, where are the facts, where is the evidence? These people think empirical has something to do with royalty .

  14. Haven’t read the book, so don’t know anything about the blood-type diet. But thinking that one diet is the right way of eating for all seven-billion + humans in the planet doesn’t make sense to me. Look how different all of us are in many ways. If superficial differences are not important, look how differently we react to external stimuli, like food, in immediately measurable ways? For example, some people can eat half a pound of beans everyday without any problem; others can’t eat an ounce occasionally without developing gas problems.

    1. I would tend to agree. I think the bean and gas connection is interesting and folks don’t give beans enough credit. I mean the science on beans is there, so I see very good reason to incorporate more beans into the diet. Of course, if they “tear you up” even with an ounce avoid them like the plague, but I have seen little research to support this. No doubt I’ve heard folks mention it anecdotally and I’d never tell someone to eat something that causes bloat and pain, it’s just that I’ve found most folks can tolerate beans in the end.

      1. Totally agree and in my experience, most people who EXPECT beans to cause them problems, experience them! I know because I WAS one of them! LOL! It’s amazing how when you change your perspective, everything follows suit! I love beans now, but that is just a tiny example…changing my diet changed my entire life, and even though I am certainly getting older, (a good thing now!) it just keeps getting better! Thank you Nutrition Facts/Dr Gregor, you rock!

    1. Try Cronometer. They have an app and a website. You enter your food in and it will give you all the info you need.

  15. thank you, I looked at cronometer and, if I can be honest here I am an impulsive emotional eater and if I have to count a calorie I am afraid it has already been eaten and to late to consider its fate. For my purposes I am thinking categories like fruits, whole grains, beans, greens, vegetables. so if I eat a cup of fruit, 3 cups of cooked grains in their whole form, 3 cups of cooked beans, and 4 cups of cooked greens and miscellaneous raw vegetables a day is that an optimum plant based diet if it meets my caloric needs? If I need to cut calories out what should be the first portion to reduce in size?

  16. Good job! As the famous quote goes, ” it’s not what we don’t know that hurts us…it’s what we ‘know’ that JUST AIN’T SO!!

  17. His associates are medical doctors, with a difference approach to heal. Most of them educated themselves about nutrition, in contrary to any ‘conventional’ M.D, who knows next to nothing about it.
    Examples of these doctors: B. Weeks, M.D, Stanislaw Burzynski, M.D, PhD, L.E. Connealy M.D, B,Johnson, M.D, NMD, D.O, R. Mitchell, M.D, S. Pai, M.D, S. Tenpenny, D.O., any MANY others.
    One day, in case you get cancer, go and get his book or watch his video’s, because once your oncologist will tell you, there is no help, after having trashed your body with chemicals and radiation, there is maybe better solution, which actually WORKS. So maybe it is better you know about it, before it is too late.

  18. Just because I don’t know how a black cow that eats green grass and produces white milk doesn’t mean it isn’t a reality… or that I can’t enjoy it or otherwise benefit from it. Science can’t prove “love” either, but that doesn’t mean it doesn’t exist. It is important to consider decades of human experience into account when it comes to new diets just as it is important to consider millennia of human experience when it comes to the safe usage of plants, herbs, etc. Some things cant be understood until we have the tools to do so. Think blood cells, bacteria, viruses… or elements, atoms, atomic particles, sub-atomic particles… or quantum physics.. or almost everything else “science”:denied… until they didn’t. Philosophy ALWAYS leads science.

      1. Different TYPES of Grasses?.. Hay?… Corn?… Alfalfa?… Insects (within the aforementioned)?… Cement?… Basically they eat whatever they are fed. Plus, cows aren’t smart enough to observe the world around them… and make choices as a result. :-)

    1. The burden of proof, the obligation to prove one’s assertion, is upon the claimant.
      When someone makes claims that their claims are a proven theory then they are responsible to provide evidence. In medical science anecdotal evidence and testimonials are NOT considered substantial evidence to support a claim.
      After more than a two decades Peter D’Adamo’s has not provided sufficient (high level medical science) evidence to support his Blood Type claims.
      Sure and even a broken clock is correct for two minutes a day… but that is NOT valid proof of an accurate clock!

  19. am I missing something here??? Quoting Dr. Peter “there is good science behind the blood type diet,” but The reason we don’t see any studies on blood types and nutrition, he complains, is “because of little interest and available money.” I need to give my head a shake I guess! Is there science Dr. Peter or not ??

  20. I’ve been vegan for seven years.
    I’m grateful for Dr. D’Adamo’s book, which I read almost two decades ago. It suggested I avoid chicken & I immediately stopped eating chicken (I wasn’t eating meat).
    However, I am also very glad that I didn’t take his advice to add back snails, lamb, mutton or rabbit (which were listed as ‘highly beneficial’ for my blood type).

  21. I remember reading the original theory by that researcher, although the name is somewhat changed for this diet .Although the concept was decried as a Nazi idea, I remember having my doubts in that (for example) people who have had too many Fava beans in their diets tend to get anemic. I had learned about the iron platelets in blood, and began to try to understand misplacement, motion or discolouration of these platelets. I am asking – isn’t anemia from a culturally based diet inherited? Particlarly, I have long term vegetarian diet because my parents both suffered form osteo-arthritis (from too much red meat, I had read). Here again, isn’t the consumption of meat a co-relative of ones’ offsprings’ inherited “sins”? I say sins as if injuries or blemishes.

  22. Not totally off topic, but a nagging question I would love to hear some intelligent feedback on… which is why I am posting here! I am one of the approx 6% with A neg. blood, (out of a total 15% of ALL Rh negative blood-types) and had 2 O pos. sons, so I am obviously well aware of haemolytic disease and the joys of rhoGAM! (My mother wasn’t so lucky.) So being the ever inquisitive type, I have always wondered what evolutionary trait could have possibly selected for systematically destroying one’s offspring, the total antithesis to life, which to me kind of defies natural laws! I understand random mutations and all, genetic disorders, etc., but usually when even a seemingly defective trait is *perpetuated* it has some survival advantage, like sickle cell and malaria for example. So what am I missing? I am pretty broad minded, so the following paragraph caught my attention even though it creates more questions than it answers. Could someone, anyone, please help ground me and frame this before I start watching the skies for my “real” ancestors? LOL!

    “All animals and other living creatures known to man can breed with any
    other of their species. Relative size and color makes no difference. Why
    does infant’s haemolytic disease occur in humans if all humans are the
    same species? Haemolytic disease is the reaction that occurs
    when an Rh negative mother is carrying a Rh positive child. Her blood
    builds up antibodies to destroy an ALIEN substance (the same way it
    would a virus), thereby destroying the infant. Why would a mother’s body
    reject her own offspring? Nowhere else in nature does this occur
    naturally. This same problem does occur in mules – a cross between a
    horse and donkey. This fact alone points to the distinct possibility of a
    cross-breeding between two similar but genetically different species.”

  23. I would love to know what could Dr. Greger tell me about the zone diet, the principles behind it (in a vegetarian way) and not with all the food products they have lauched. Thanks.

  24. Did you read the PubMed article you sited? You quoted your friend for the HEADLINE about CRASS FRAUD, you site ONE article about Cholesterol and suggest this makes it a fraud? And you mention failure against Cancer and Arthritis, two rather difficult targets…you expected success? ANYWAY…you used this as your premise for dismissing the idea….AHEM… And I quote…
    Sixteen articles were identified from a total of 1415 screened references, with
    only one article that was considered eligible according to the
    selection criteria. The identified article studied the variation between
    LDL-cholesterol responses of different MNS blood types to a low-fat
    diet. However, the study did not directly answer the current question.
    No studies that showed the health effects of ABO blood type diets were

    ***ONE of 16 from 1415 references…ONE considered eligible…Conclusive? LMFAO…dude you are a doctor? Hmm I notice proud statement about being published on…rather hard for me not to be a bit suspicious;) AND you started off on a rather unusual footing…Hitlers ‘Big Lie’, ‘Crass Fraud’ indeed…;) AND I google translated your Norwegian article it’s not conclusive and it is more of an opinion piece IMHO;)

  25. In addition to the blood type diet, I have also been “prescribed” the yeast-free diet. Besides having trouble sticking to all the restrictions, I’m worried about the lack of variety and nutrients I might be missing with this plan. Any thoughts?

  26. You are wrong. You are judging his work by his 20 year old book? My goodness, the rest of his books all show the science. Then ten years ago he started in on epigenetics, how genes react to the environment. Then he mapped out every pathway in the body and what herbs might be useful, with links to the research. Now he analyzes genetic data, and puts everything together with algorithms. He did indeed have the outcomes documented.
    I started following his program 19 years ago and I am a 20 year breast cancer survivor. He seemed to be the only doctor who figured out 30 years ago, type A blood,people have more of a propensity for cancer, and breast cancer is A like and has lower survival rates.

    1. What about?
      Are you trying to offer this study on “relationship between CAD [coronary artery disease] and each type of ABO blood group” (nothing to do with diet) as evidence for Blood Type diet?

  27. one of my friends they are into the blood type diet, her husband follows it and he lost a little bit of weight, and because they are blood type A, they eat mostly vegetables,, I guess they are lucky because they choose mostly organic and they it worked for them. My female friend hasn’t seen any difference in her weight. I am blood type positive B, Im suppose not to eat tomatoes and sesame, and I can eat lamp and other red meat, but I am a vegetarian and supposedly I will feel low energy in my muscles etc, I can proudly say that I am a highly energetic individual and the proof is in my professional dancing, 34 years old and I could dance for hours, my clothes where soaky wet from the dancing and I have absolutely no problem either I will feel tired. In the past from cooked food and junk food I used to suffer from acid reflux, when I stop eating junk food and cooked food, and my diet is 80% raw food, eggs and rarely some pasta and cheese, I have NO reflux at all. I still eat lots of tomatoes, and sesame and cinnamon. I am very fit, highly energetic, and even when I gain little weight, I can loose it easily. Blood type diet was only good because it suggested to eat good quality food, so I guess some people saw some difference because of that, but processed meat and especially eating a lot of meat, like it is suggested for the O blood type, is associated lately with high risk of cancer, especially colon cancer which they actually measured the length of telomeres, which is a real science, by not eating certain foods someone might risk low intake of good nutrients that might be very beneficial to ones system, not only there are 0 pure scientific evidence, I think such diet could put peoples health at risk.

    1. The blood type diet should be put put to the test using a cohort-study of sick people. It’s perfectly natural that the BTD will produce very negligible differences in healthy people, especially since each of the blood type diets is fundamentally healthy whole-foods diet. A useful study would be one looking at a health-compromised population, for example individuals with digestive disorders, metabolic syndrome, autoimmune diseases. Most chronic illness is accompanied by changes in cell glycosylation and host microbiome, and it is these changes that define the differences in how each blood type might benefit from a specific diet. An Italian doctor, Piero Mozzi, has been applying these theories for twenty years now on tens of thousands ill patients with unprecedented results. He’s also realised that not only neutral and beneficial foods (with personalised adjustments always necessary) were enough for optimal health but also food combining was crucial, with cereals+sugars/fruit, cereals+meat, dairy+legumes, fruit+legumes, cereals+legumes being the worst and definitely avoid examples in persons with compromised health.

  28. I have tested this Blood Type Diet and it works for me. I tried every other fad diet and even exercise and the Blood Type Diet is the ONLY thing that has worked for me. I am 37yo and am B+. I feel more energetic, more confident and have lost 30lbs worth of toxic fat. Maybe, Dr. Greger, you should try it for a week (if you haven’t already, I did not see if you did) and then make up your mind, I bet you will change it. Thank you for listening to a blood type dieter for life. Z

  29. I once heard that everybody’s idea sounds crazy until they prove the world right. Except for this guy. He is an idiot. Since there are such free reigns on writing a book, I believe I will start my own on how toilet water can help you fly. It is still in research at the moment. I will finish the book this month and the research should be done in about 7 more years.

  30. I have read a few posts here where others have commented on how the diet has worked for them. So let me ask you all this. How many of his diet plans in the book suggest you devour loads of ice cream? How many of his diet plans suggest two candy bars and a soda for snacks? How many of his diet plans suggest Sugar Smacks cereal with chocolate milk for breakfast everyday? I am going to assume that none of the diet plans do. What I will assume is that every diet plan, regardless of which blood type, contains healthy foods and most likely a limit of those foods. So basically the diet plans are more regional than actually individual. One plan might say to eat tomatoes while another plan says to avoid them and eat more broccoli. The blood type diet has about the same effect as reading your horoscope. You can read your sign, but then notice that other signs also relate to you. This is because we are all human. What we need to think about is what kind of food is more natural for us. Wheat? Not at all. Rice? Not really good there either. Hell, even potatoes are not good for us. All of these are high in carbohydrates and prevent our body from producing the ketones we actually need. So instead of trying this idiotic diet, instead look at low carb diets with high fat content. That is the kind of food our body has been designed to handle. We have monogastric digestive systems with no cecum and an inoperable appendix. We do not really digest plant matter the way that our food does. So look for fatty natural foods with little to no carbohydrates that are rich in omega-3’s. This is what every body craves. And surprisingly a high-fat diet keeps you from getting hungry often.
    Since I am on a roll. Have you ever wondered about our idiotic thinking about fatty foods. Don’t feel bad about how you thought about it because the government has taught us to not like fats. If you eat fats they are going to get you fat. If you eat vegetables you will stay skinny and healthy. So I ask. What does a cow eat? Why do cows have fat on their bodies? Why do domestic cows have more fat on their bodies than free-range cattle? How much fat does a lion have? How much unhealthy fat does a lion eat? I believe you can put the pieces together here. Fat is produced by sugars, something we all know. Sugars are not a natural majority of our diets. Meat and fish are a strong part of our diets. We digest fatty foods 100 times better than we do vegetables and we burn fats much better than we do sugars.

  31. I tried the diet for my son with ADHD. We did the GAPS diet for 1 year. He did about 40 percent better on this high fat, meat, veggie, gut-healing diet. Most of us are As though, and after 6 months on this BTD, he has greatly changed. There are many influences on our health, but diet is the strongest. I eat the BTD but still don’t eat wheat or spelt. I feel that my gut is still healing. But I feel noticeably younger and mentally happier. This is not placebo. Nor is it clean eating because I have done that for years. I don’t feel the mental high all the time, but life is different. I know this for a fact— my son knows nothing of the placebo effect– he just wants food that tastes good.
    Initially it was a nutritionist with a phD who recommended this diet to me. Within the diet, there are ways to continue to improve. A lifetime of bad choices takes time and fine-tuning.
    There is nothing like trying something for yourself. Health is a blessing. Yes I think Dr. D’Adamo has blessed us.

  32. Well, gee whiz, maybe when I went off the Blood Type Diet and went on the plant-based diet for a year and a half I didn’t feel fatiqued after all? Sorry Doctor, but The Blood Type Diet works for me! Lots more energy than the plant diet and a lot less arthritic pain. In addition, I have many food allergies
    and they are all listed under the Avoid foods! Can you explain that one?

    1. Perhaps not scientific evidence, but perhaps borderline statistical evidence. As a retired scientist, I have been enjoying the Blood Type Diet since 1993 within a group of 2000+ others (which just now gives me the thought of perhaps starting a Blood Type Diet Church….lol)

  33. As a scientist, you know that testimonials and groups of people in support of something is not ever considered evidence, especially without a control group, due to the likely placebo effect and inability to rule out other variables. Lets not even mention there is ZERO rationale or evidence for the underlying mechanism that is supposed to make it work.

    Dr. Ben

  34. Two things happen immediately after I start the Blood Type diet. 1. I am no longer always hungry and, 2. My desire for sugar goes away. After a week, I start to deflate and am not as bloated. I eat food that I prepare from whole foods…nothing processed. I feel great, I don’t count calories, I always feel satisfied, so I don’t feel hungry or a need to cheat – and I still lose weight. I do not restrict carbs…or only eat fatty meats…my diet is very balanced, save for a very few items that I can live without. If that’s a kooky fad, I’ll take it, because being perimenopausal, losing weight felt impossible…till this diet. So, say what you want…but why don’t you try it for yourselves.

  35. I wholeheartedly agree with this article! One HUGE glaring lie D’Adamo tpld is yhe 0-blood does NOT have the rh factor. BS…I’m 0- was tested after my 2nd pregnancy snd was 0 neg w/rh factor.

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