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. I have read, and generally follow, an O blood type plan (as it is paleo anyway). But I saw an “8 constitution acupuncture” practitioner, and as a “pancreatonia” constitution body type my diet is mainly paleo anyway, omitting spicy, citrus and poultry. **shrugs**

    Judijo wrote on May 30th, 2013
  2. my whole family pushed me towards this diet when I started having all kinds of gut and hormonal issues. But being a type B, they suggest a high tolerance to dairy products and quite a few grains, and low tolerance for chicken among other things. Being that I am lactose and soy intolerant, I was hesitant. My body tells me that I do better with high protein content and some fiber, that’s what I stick to. Chicken isn’t the thing that’s killing me. I’m pretty sure.

    andrea wrote on May 30th, 2013
  3. This really is a fascinating article. I think I may conduct my own “observational study” and determine if the above claims regarding susceptibility to disease within the different types ring true among my patients 😉

    Erin wrote on May 31st, 2013
  4. BLOOD TYPE DIET
    I follow the blood type diet and in conference with many people find that I can often figure a person’s blood type by questioning his/er food preferences and senses, and feelings after certain exercises. I do have troubles with AB types but when confused between A and B I explain my confusion and suggest AB or one of the other. Still iffy though right a little more often than not.

    Also, excruciating pain in my left hip I damaged getting up from a table a little too short for me (thirty-five years ago) was much alleviated after about six weeks by eliminating wheat. It actually took almost nine months to become mostly pain free and to be able to walk long distances but the difficulties in walking began again a year latter when I was allowing one wheat treat a week on Fridays. I then went completely wheat free again and I could again walk longer distances. Surprisingly, after the original six weeks, the skin of my legs and my feet became sensuous for the first time in my life. I was also told at the time that I would need a complete hip replacement within five years, my hip bone was so deformed (the MD thought I had bone cancer but the scan said otherwise). I have been mostly pain free now for fourteen years and haven’t had a hip replacement. I am tinkering with my height sat fat raw/cooked paleo diet in hopes my hip might further improve or even regenerate.

    I listen to my body and avoid any food that doesn’t feel or taste right or that causes reactions. I was surprised that oranges and strawberries, foods that I have avoided since early childhood were on the list. They are too acidic Dr D’Adamo claims for O BTs because Os usually have very strong stomach acids. They have always hurt my stomach. However I have always loved lemons, limes and raspberries which seem acidic but turn out to be alkalizing. Limes and lemons I used when I had indigestion for the alkalizing-neutralizing benefits. I also think most people have had such crummy dietary habits they have not tuned into their body senses. I blame modern over-processed foods, denuded soils and poor childhood diets by well intending parents. I was persuaded early in life to eat Brussels sprouts and carried the behaviour into Sunday dinners in adulthood. The bag in the freezer was tossed with glee when I read the ER4YT book. Stinky, wretched little weeds they are. Same with cauliflower and, to a lesser degree, the iffy cabbage, though the heavier flavoured broccoli has always been my favourite veg.

    Allopathy disparages the possibility of Dr D’Adamo’s work but he claims that he has tested the lectins, for agglutination, in the laboratory on samples of all blood types. It would be very easy to disprove his theory and he is an incredibly intelligent and eloquent man (I’ve seen a number of his lectures) so it would not seem terribly bright of him to straight out lie. However, I suspect, nay I know, the majority of allopaths I have met have been so indoctrinated they have no idea how locked into a box they are and are dismissive to nutrition in food as having much importance to health.

    Mark, I appreciate that you at least gave credit to the strengths and weakness of blood types when it comes to diseases. Bubonic plague is another disease that is claimed to be particularly deadly to O blood types. Such may have been the reason type A suddenly became the dominant blood type in Europe up until the Twentieth Century when O blood type again began to make up the largest group, world wide, I believe.

    Thinking outside the box is not a common trait throughout our species, Mark. It may be a sense favoured by far less than ten per cent of the population. Creative thinking, reviewing accepted ideas and those of vocal specialists and advocates (including oneself and one’s own biases or conclusions), challenging conventional wisdoms, would have been quite a detriment, in the heat of battle to our survival when herd mentality and xenophobia were necessary for the survival of our species. Today, with modern propaganda, I suspect it is the reverse and we all need to question conventional wisdoms and especially the waggling fingers of the medical professions and scientists. Prevailing trends often are the source of their incomes and that, for the empowered, is often an underlying thorn preventing any discussion of conflicting ideas which are seen, possibly feared, as threats to personal beliefs or assumptions. I call upon the histories of Galileo and Semmelweis to support my case. One was harangued by religious dogma and the other by the profession in which he lived and of his own steadfastness, over-exuberance and strong bearing.

    I don’t expect the closed minded to give a newts whisker for any thought or notion that challenges their worlds, but I do expect the creative thinker who thrills when a personal wisdom is challenged, to keep an open mind and willingness to ponder the possibilities of even the most foreign and challenging of possibilities. If one’s mind is made up on either side and all edges to the possibilities of alternative thinking such as (—alien beings, speeds far in excess of the speed of light, 911, questions to climate warming, the source of the sun’s energy, the idea that science cannot explain the possibility of ping pong and other sports at such speeds, the possibilities of an ever-being, conscious universe or that consciousness, self and mind might reside outside the brain—) let them sit in the comforts of their knowledge. All ways of thought have their purpose in the progress and success of our species for both keep the other grounded and challenged at appropriate times.

    mhikl wrote on May 31st, 2013
  5. 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
  6. 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
  7. 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. http://www.marksdailyapple.com/search-results/?cx=004987908667488763946%3Akd-fp2c7jek&cof=FORID%3A11&ie=UTF-8&q=not+losing+weight

      b2curious wrote on June 3rd, 2013
  8. 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
  9. My blood type is C+, just barely above the average blood type.

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

    Jenny wrote on June 1st, 2013
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
    RACE AND GENETICS DOES NOT CORRELATE WITH GEOGRAPHIC ANCESTRY: GENETIC ANALYSIS ENABLES US TO DETERMINE THE GEOGRAPHIC ANCESTRY OF A PERSON AND MIGRATIONAL HISTORY OF A PERSON´S ANCESTORS WITH HIGH DIGREE OF ACCURACY

    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
  27. 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
  28. 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
  29. 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
  30. Here’s a recent article on a study by Belgian researchers that say there’s no evidence on any health benefits with the BTD.

    http://www.reuters.com/article/2013/05/30/us-blood-type-diets-idUSBRE94T0XD20130530

    Liz wrote on July 6th, 2013
  31. 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

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