Does the Blood Type Diet Really Work?

Written by Dr. Steve Chaney on . Posted in Food and Health, Issues

Is Eating Right For Your Blood Type A Sham?

Author: Dr. Stephen Chaney

cb43e76f-6bf7-4e82-8fc1-95005d2c5626Does the Blood Type Diet really work? In 1997 Dr. Peter J. D’Adamo wrote a book about the blood type diet called “Eat Right 4 Your Type”. Dr. D’Adamo claims that people with different blood types process food differently, so their blood type determines the type of diet that is healthiest for them. Specifically, he claims that people with:

  • Blood group O are descended from hunters and should consume high protein diets.
  • Blood group A are descended from farmers and should consume a near vegetarian diet – completely avoiding red meats.
  • Blood group B are descended from nomads. They have the most flexible digestive system and can eat the widest variety of foods – even dairy products, which he does not recommend for any of the other blood types.
  • Blood group AB are an enigma and are somewhere between blood group A and blood group B.

It’s an interesting concept. Dietary recommendations are made for populations as a whole, and there is tremendous genetic variation in populations. Because of that genetic variation, there is no perfect diet for everyone. Every knowledgeable health expert will tell you that.

The question then becomes “How do you know what kind of diet is healthiest for you?”

The blood type diet is a very simple system. Your blood type is easy to determine. Once you know your blood type you know what to eat. There’s no guesswork.

Could it really be so simple? Over 7 million copies of Dr. D’Adamo’s book have been sold. Millions of people believe in this concept. So it is only fitting to ask “What is the evidence?”

An Objective Scientific Analysis of the Blood Type Diet

There is no doubt that blood type is related to some human genetic and physical traits, but the important question is whether blood type is related to the health outcomes of different diets – the central thesis of Dr. D’Adamo’s book. A Belgian group lead by Dr. Emmey De Buch did a systematic search of the scientific literature to answer that very question (L. Cusack et al, Am J. Clin. Nutr. , 98: 99-104, 2013).

They identified 1415 scientific articles that had the phrase “blood type diet” in either the title or abstract. Then they begin the elimination process. They eliminated:

  • Studies done in test tubes, cell culture, or animals. Only human clinical studies were included.
  • Reviews, commentaries, letters or opinions. Those contained no original scientific research.

At this point they were down to just 16 published clinical studies. Then they asked which of those studies were designed to test the central hypothesis of the blood type diet. They asked:

  • Did the study start with human subjects grouped according to blood type?
  • Did the study have an intervention in which the subjects were required to adhere to a particular type of diet?
  • Did the study measure a health outcome of the dietary intervention?

Guess what? Only one study met these criteria. Just one! And it was a fairly weak study involving a totally different blood typing system than the ABO blood groups.

The Bottom Line:

1)     There is no scientific evidence supporting the blood group diet. A lot has been written about the diet, but nobody has actually shown that it works. The Emperor Has No Clothes!

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure or prevent any disease.

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Latest Article

100th Issue Celebration: The Latest Developments in Health, Nutrition, and Fitness

Posted February 24, 2015 by Dr. Steve Chaney

Looking To The Future: The Next 100 Issues

Author: Dr. Stephen Chaney

100th issueIn the roughly year and a half that I have been publishing “Health Tips From The Professor” in its current form, I have tried to go behind the headlines to provide you with accurate, unbiased health information that you can trust and apply to your everyday life. The 100th issue of any publication is a major cause for celebration and reflection – and “Health Tips From The Professor” is no different.

I am dedicating this issue to reviewing what has been covered in the last year and a half and reflecting on the future direction of this publication. Let’s start by looking at some of the major issues that have been covered.

Environmental Toxins and Our Health

We live in an increasingly toxic world. Some of those toxins come from industrial pollution. Some come from agricultural pollution (pesticides and herbicides). Some come from household pollution (cleaning products and outgassing from carpet, drapery, etc.). And some come from the additives that BIG FOOD adds to the processed foods we eat.

I’ve covered the effects of a few of those toxins on our health in articles like “Do Toxic Homes Cause Asthma?” , “Are Toxic Chemicals Lowering Our IQ?” , and “Do Artificial Colors Cause Hyperactivity?”. Look for more information along those lines in future issues of “Health Tips From The Professor”.

Exercise and Our Health

exercise and healthMany of you exercise on a daily basis and would like more guidance on the best exercises and how you can best support your exercise nutritionally.

I have covered the benefits of exercise in articles like “Run Long and Prosper”. I have covered nutritional approaches that support exercise gains in articles like “Does Leucine Stimulate Muscle Growth?” and “Do Protein Needs Increase As We Age? “.  Finally, I have covered the dangers of many of the sports supplements on the market in articles like “Are Fat Burning Supplements Safe?”, “Are Sports Supplements Safe?”, and “Sports Supplements To Avoid”.

I plan to expand these topics in the coming year and perhaps bring in an expert who can advise you the best exercises for a long and healthy life.

Healthy Eating

Most of you have told me that you are very interested in healthy eating.

I have covered healthy eating in general with articles like “Can Diet Alter Your Genetic Destiny?” , “The Seventh Generation Revisited” and “Are Organic Foods Healthier?”.

I have talked about foods and eating patterns to avoid with articles like “Does Sugar Cause Heart Disease?”, “Do Sodas Cause Arthritis?” and “Do Grilled Meats Cause Prostate Cancer?”.

I have covered controversial areas with articles like “Are Saturated Fats Good For You?” and “When Is GMO not GMO?” and a webinar on “The Truth About Genetically Modified Foods”.

Look for more healthy eating articles like these in upcoming issues.

Obesity

obesityI don’t need to tell you that in today’s world obesity is a huge problem (pun intended).

I have covered some of the less known causes of obesity in articles like “Do Diet Sodas Make You Fat?”, and “Can Gut Bacteria Make You Fat?”.

I’ve covered the risks of obesity in articles like “Belly Fat Could Be Killing You?” and “Does Belly Fat Make You Dumb?”.

Finally, I’ve given you some useful tips on how to lose weight in articles like “What Is The Best Diet For Weight Loss?”, “Are High Protein Diets Your Secret to Weight Loss?”, “7 Easy Ways To Spot Fad Diets”, and “Do Diets Really Work?”.

Look for more informative articles like this in future issues.

Family Nutrition

I have had lots of requests for articles providing nutritional advice for young families.

I have written articles for women such as “Women’s Heart Health Begins At 20” () and “Do Omega-3 Fatty Acids Decrease The Risk Of Depression In Women?” . I have written articles for children such as “Can DHA Help Johnny Read?” and “Do Foods Make Them Fidget?” (coming next month). I have written articles for men such as “A Big, Fat Problem With Testosterone”. I have even written articles about gender differences such as “Is Omega-3 Uptake Gender Specific?”.

Look for more articles like these in future issues.

Debunking The Nutrition Myths

mythsThere is a lot of misinformation on the internet, and some of that misinformation has been repeated so often that it has become generally accepted as true. It has become what I refer to as a “nutrition urban legend” or nutrition myth. I have done my best to shine the light of science on these myths and expose them as the untruths that they are.

For example, I have debunked the myths about soy in articles like “Does Soy Increase The Risk Of Breast Cancer Recurrence?”, “Should Women With Breast Cancer Avoid Soy?” and my video “The Truth About Soy”. I have debunked myths about antioxidants in articles like “Do Antioxidant Supplements Cause Cancer?” and “Do Selenium & Vitamin E Cause Prostate Cancer?”. I have debunked myths about omega-3 fatty acids in articles like “Do Omega-3 Fatty Acids Cause Prostate Cancer?”. I have debunked the myths about calcium in articles like “Do Calcium Supplements Increase Heart Attack Risk?”.

However, debunking nutrition myths is a lot like the “Whack a Mole” game you see at state fairs. As soon as you debunk one myth, another one pops up somewhere else. For that reason I will continue to expose nutrition myths in future issues of “Health Tips From The Professor”.

Exposing The Lies

Unfortunately, there are a lot of charlatans in the food supplement industry, and some of their more sensational claims are popularized by doctors who should know better.

I have tried to expose the worst of these unsubstantiated claims in articles like “Can Chocolate Help You Lose Weight?”, “Water Is Water” and “Is Green Coffee Bean Extract Bogus?”.

Unfortunately, the charlatans truly believe that a “sucker is born every minute” so there will always be new products and new outrageous claims. I will do my best to protect you from products that drain your pocketbook but do not provide you with any substantiated benefits.

Telling The Truth About Supplementation

supplementationOn one hand you have experts who tell you that supplements are a waste of money. They don’t do any good. On the other hand, you have people who tout supplements as cure for whatever ails you. Neither extreme is accurate. I have done my best to bring balance and scientific rigor to this discussion with articles like “The Two Biggest Misconceptions About Supplementation”.

The Naysayers base their advice on studies of supplementation in healthy populations, something we scientists refer to as primary prevention studies. Because 95% or more of the healthy test population will never develop the disease being tested for within the time period of the study it is almost impossible to demonstrate a beneficial effect of supplementation in that kind of studies. I have illustrated that point by highlighting the difficulty in proving that statins provide any discernable effect on heart disease risk in healthy populations of people who have not experienced a prior heart attack in my book “The Myths of the Naysayers” and my article “Can An Apple A Day Keep Statins Away?”. If you can’t even show that statins prevent disease in healthy populations, why would you expect to be able to show that supplements prevent disease in those populations?

However when you look at the effects of supplementations in populations at high risk of developing disease (because of age, poor diet, increased need, genetics or pre-existing disease) supplementation does appear to be effective. I have highlighted these studies in articles like “Is Fish Oil Really Snake Oil?”, “Do B vitamins Slow Cognitive Decline?”, and “Do Vitamin D Genes Affect Mortality?”.

In future issues I will continue to highlight the benefits of supplementation. Unlike, the more sensational blogs, however, I will also be quite clear about which population groups are most likely to benefit.

Of course, I can’t cover all 100 issues in this one article. Suffice it to say that I have also provided you with information on nutritional breakthroughs that may dramatically decrease your risk of cancer, diabetes, heart disease and much more. You can find many of these articles just by going to http://www.healthtipsfromtheprofessor.com and entering the appropriate term in the search box.

What Does the Future Hold?

I have just touched on a few of my most popular articles in the list I gave you above. You may want to scroll through that list to find articles of interest to you that you might have missed. If you don’t see what you are looking for, just go to http://www.healthtipsfromtheprofessor.com and type the appropriate term in the search box.

In the coming year you can look for more articles debunking myths, exposing lies and providing balance to the debate about those health topics that affect you directly. As always I pledge to provide you with scientifically accurate, balanced information that you can trust. I will continue to do my best to present this information in a clear and concise manner so that you can understand it and apply it to your life.

Based on input that I have received from many of you I will increase my coverage of exercise and topics of interest to young families. I will also be bringing back Julie Donnelly as a guest expert for a series of articles on how to relieve back pain. Julie is an expert on deep muscle massage therapy and her articles on self-treatment for muscle pain have been among the most popular over the last year and a half. I know you will be happy to have her back.

If you have other topics that you would like me to cover, please click on this link to enter your suggestions in the comment box.

 

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure or prevent any disease.

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