The GenoType Diet: Complete Review

By Mike Howard


Nutritional Genomics seems to be the future of nutritional science.

In time, we will be able to take the guesswork out of which foods/nutrients will work best for individuals under virtually any circumstance.

The GenoType Diet, by Dr. Peter D’adamo, suggests that eating based on our genetic make-up is the key to optimal health, fat loss and other desirable attributes.

Revolutionary or a Flawed Attempt?

One of the most formidable flaws of today’s diet book is the one-size-fits all mentality. Ie. diet X is the best/only/easiest/all of the above diet for everyone… all the time. Hence, it is refreshing to see a diet book that makes an attempt to customize eating plans based on a factor that is central to our being – our genetics.

On the flipside, this is the “Blood-Type guy”. Eat Right for your Type scored big with the book-buying public but drew the ire of academics for its lousy science. Regardless, this is a different book and I was determined to approach it with the utmost of objectivity.

Dr. D’adamo paints a very easy-to-understand and yet very clever explanation on our genetic make-up works and how/to what degree we can alter/change it. He compares our genetic codes to a town meeting, whereby we have the capacity to turn up the volume on good genes and silence the bad ones.

Here’s How It Works:

There are 6 different geno-types, each one outlining characteristics such as; body type, traits, strengths, weaknesses and disease predispositions. They are as follows:

  1. GenoType 1: The Hunter
    Tall, thin, and intense, with an overabundance of adrenaline and a fierce, nervous energy that winds down with age. Hunters have swift immune systems which is great on one hand but makes them prone to auto-immune disorders on the other.
  2. GenoType 2: The Gatherer
    Full-figured, even when not overweight, the Gatherer struggles with body image in a culture where thin is “in.” With a “Whoever dies with the most wins” motto, Gatherers have thrifty genes whose primary goal is to hang on to every ingested calorie for dear life — literally.
  3. GenoType 3: The Teacher
    Strong, sinewy, and stable, with great chemical synchronicity and stamina, the Teacher is built for longevity — given the right diet and lifestyle. The Teacher represents the third basic response to a challenging world: altruism. “All you need is love” is the Teachers’ motto, and their immune systems reflect it. Teachers are able to tolerate a wide variety of unfamiliar bacteria, viruses, and microbes, avoiding the hair-trigger symptoms. Unfortunately, they sometimes welcome infectious elements that they would do better to repel.
  4. GenoType 4: The Explorer
    Muscular and adventurous, the Explorer is a biological problem solver, with an impressive ability to adapt to environmental changes and a better-than-average capacity for gene repair. They are good at adapting to different conditions but are vulnerable to hormonal imbalances.
  5. GenoType 5: The Warrior
    Long, lean, and healthy in youth, the Warrior is subject to bodily rebellion in midlife. If Warriors are physically active, their metabolism burns hot; when they lead a sedentary life, they tend to put on the pounds with alarming speed.
  6. GenoType 6: The Nomad
    A GenoType of extremes, with a great sensitivity to environmental conditions — especially changes in altitude and barometric pressure — the Nomad is vulnerable to neuromuscular and immune problems. Yet a well-conditioned Nomad has the enviable gift of the ability to control caloric intake and age gracefully.

There are a series of evaluations/questionnaires offered to help determine which type you are. For each type, there is a description of disease susceptibilities, a metabolic profile, an immune system profile and do’s and don’ts.

Genotype Evidence?

If that old bird from the Wendy’s commercials were still around, she would probably ask “WHERE’S THE SCIENCE?”

It would seem logical that we would be evolutionarily geared towards certain diets. It would also seem logical to assume that we can make the most of our genetic potential by eating the right way. In this sense, I agree with the global concept that we can counter genetic predispositions through proper eating. The specifics of the diet however are puzzling.

It just doesn’t jibe with me that my blood type, the shape of my head or the length of my index finger in relation to my ring finger (some of the traits that determine our geno-types) would be sufficient enough data to determine whether certain foods are toxic or healthy.

As an example, according to my profile I am Hunter. In my list of foods, Atlantic salmon is considered toxic to me, while Chinook salmon is a superfood. Huh? I was also devastated to learn that kangaroo and opossum are to be avoided for my type.

The problem with me attempting to rubbish the concept, however is that I am neither a geneticist, an anthropologist a nutritionist or an anthronutritionalgeneticist (I don’t think such a title exists, but hey it sounds cool).

So rather than speculate, I asked an expert on the subject of Nutritional Genomics. The professor (who asked to remain anonymous) told me that he is not aware of any such evidence to support D’Adamo’s claims.

Another red flag is that D’Adamo did not include any journal references and there are none to be found on his website. This leaves me to conclude that he has presented interesting but unproven ideas.

Overall Impression

It’s a bit of a task to get through the book and to fully understand the principles (at least for me it was). I think it gives a wonderful overview of the relationship between our genes our pre-natal environment, our bodies, and our environment.

The idea of eating for your own personal genetic code is going to have a bright future when it comes to nutritional science. I don’t think this particular concept is it though. Too many questions still abound about the specifics of his suggestions. There aren’t enough scientific rationalizations to be able to make such specific food selections – at least not any that I know of.

Also, this book is a bit like the last episode of the Sopranos. I was left thinking “That’s it? That’s how it ends? There were no meal plans, recipes or specific guidelines. I later figured out that you have to go to the website and pay for that information.

The Verdict

It wouldn’t hurt to give it a try just for something different – the guidelines are pretty sensible regardless of the geno-type.

Just don’t put too much credence in the science behind it.


  1. Erl

    Only fools, hacks, and trolls would say there is no science behind Dr. D’Adamo’s recommendations. It is ALL SCIENCE, including the science of Epigenetics. He is recognized as a world authority in Egigentics as applied to nutrition and lifestyle. Anyone citing, ‘ lousy science,’ in rewlation to Dr. D’ Adamo is either not a scientist or a lousy industry hack scientist. Dr. D ‘Adamo is a professor of Clinical Studies, and Adjunct Professor of Clinical Nutrition at several schools. He is revered by the International Medical College of Epigenetics. Stones are thrown by fools like thee, But scholars laude Dr. D

  2. Paul

    That people are “not aware of any such evidence to support D’Adamo’s claims” makes sense in that this is a new area of research and others will have to pick it up and see where it goes. My bet is that if there are already good indicators that his approach is having success among people trying it out, there will be plenty of powerful people who will finance showing showing anti-results or finding other ways to naysay this work, largely because it would be considered a troublemaker to vested economic interests. Happily, lots of people today are smart enough to try things out and issue their own empirical reports.

    • Erl

      Dr. D’Adamo is a clinician and a professor of clinical studies, adjunct/visiting professor of Clinical Nutrition; and has 30 years of ongoing research supporting his work. He is also a revered member of the International Epigenetics College, serving as their keynote speaker last fall. Blood Type and Diet research has gone on for 7 decades. Two groups are his critics, turf protectors, including docs who got a degree 30 years ago and have never thought an original thought; and hacks. I have never heard criticism from anyone who actually read the research behind his recommendations.
      Remember the Atkins Diet; very adept to Blood Types O and B and to a lesser degree AB. Of course it was such a threat to status quo and investment portfolios; BUT, Harvard University scientists, after a 7 year study concluded that the Atkins diet was far superior to the Standard American Diet, and the only diet they tested , in the lab, and with control groups that caused sustained weight loss in the obese. Like Dr. Paavo Airola, Harvard’s follow up determined that after achieving desired weight loss that many folks had to broaden the diet to add more complex carbs to achieve maximum health. Therapeutic diets are not healthy diets. The difference with the D’Adamo approach, is health is established by eating the foods applicable to various blood types. Weight normalization is but a small part of attaining and maintaining optimal health. It is not a diet, it is a way for health.

  3. The

    It would be also logical that calories in = calories out, but it is not. Saying wheres the science is stupid, since it is the most scientifically tested method that I have seen (next to Montignac).

  4. Daunen

    I love this diet, which is a refined version of his Blood Type Diet. I lost over 20 pounds in about three months.

  5. Hunter

    I believe the point of the book is not about losing weight, it’s about eating right for your (geno)type to provide your body with the fuel it needs to perform to the best of it’s ability.
    The book was recommended to me by a friend who has seen great health benefits from it, although she herself was already very slim and had no interest in losing weight but was suffering various pains that dieticians and doctors had been unable to explain. She tried the Genotype Diet and noticed an immediete difference just by cutting out 1 or 2 foods that were suggested as toxins to her genotype.

    I guess if you just want to lose weight then there are hundreds of people willing to take money off you in exchange for step by step recipes. But if your interest is in finding out whether changing the food you eat will have an overall benefit to your health, energy levels and general well being then this may be worth a look.

    So you might be outraged to find out you should avoid strawberries – eat pineapple instead – you might find you feel better for it.

  6. Theresa

    Finally a comment that makes some sense.

  7. margaret

    I was looking for something to help me feel healthier and that seemed more logical than the one diet fits all ones. I’ve tried them all over the years. Even if there isn’t science to back it up as many seem to be saying, historically it is accurate to how people evolved and had to adapt to their environment. I decided to give it a try.
    After 2 weeks I lost 7 lbs and was feeling a lot more energetic and more importantly the intense stiffness I felt every morning and when I’d get out of the car after my commute to work were gone. Something apparently was working to my benefit.
    I have followed the best I can, but finding the foods that I can eat sometimes is difficult I have to admit. Shopping at Whole Foods can get expensive and finding no wheat products for my genotype that I like is not always easy.
    Better than those inconveniences though is the fact that I feel more agile and energetic and at 54, that’s important.

    • Erl

      Dr. D’Adamo’s approach to Nutrition is the only SCIENCE BASED work I have read in 50 years. Dr. D is a Professor of Clinical Studies, Adjunct Professor of Medicine at several accredited schools, holds advanced studies in Epigenetics and revered by the International College of Epigenetics. Only the hacks with a vested interest have been critics and of those I’ve heard interviewed, not one had read the books let alone the decades of clinical research.

  8. Jenny Sinclair

    Atlantic Salmon is actually a trout, and not a true salmon. It’s the one that is raised in fish farms. They dye the flesh more orange to mimic Pacific Salmon.
    Pacific Salmon is a true salmon. (look up the genus and species and you’ll see that they are different)
    That’s why you may be able to eat one and not the other.
    The more we become scientifically literate, the more we will be able to understand the consequences of various decisions, and to decide for ourselves whether the things we read and the missives we receive from everyone from doctors to oil companies have any validity.
    Eat well.

    • Erl

      Not all Atlantic Salmon are farm raised. I would avoid the cage raised fishes because the unnatural Monsanto diet results in the Omega 3 fatty acids being converted into Omega 6, Arachidonic Acid, artery scaring, among other negative attributes.