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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Comments (5)

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      Dear Tiffany,
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Latest Article

Painful Shoulder Relief

Posted January 17, 2017 by Dr. Steve Chaney

Surgery Is Not the Only Option

Author: Julie Donnelly, LMT –The Pain Relief Expert

Editor: Dr. Steve Chaney

painful shoulderI was at my sailing club and a man was sitting watching the water, rubbing his painful shoulder.  I asked him what was wrong and he said he had a sore shoulder for the past three months. He told me he desperately wanted to find some pain relief. He loves to sail and this sore shoulder pain was preventing him from going out on the water.  He’d already been to a massage therapist, a physical therapist, and a chiropractor. He finally went to an orthopedic surgeon and was told that surgery was the only way to get relief from his painful shoulder. However, he had decided that he didn’t want to take that path…yet.

Why Muscles Can Cause a Painful Shoulder

I use an analogy that makes it clear why muscle spasms in your shoulder will cause joint pain.  If you pull your hair, your scalp will hurt. But, you don’t need to massage your scalp or take aspirin for your headache, and you definitely don’t need brain surgery.  You simply need to let go of your hair!

pull hairYour shoulder has more muscle attachments than any joint in your body.Each muscle pulls your shoulder in a different direction. As any of the muscles get tight it puts pressure on the bone. Your painful shoulder is the end result – just like pulling your hair hurts your head.

To get relief all you need to do is release the tension in the muscles.

Stretching WON’T Help Ease a Painful Shoulder!

It is important to untie the knots (spasms) in the muscles before stretching. Think of what happens if you take a 12″ length of rope, tie enough knots in it so it is 11″ long, and then try to stretch it back to 12″ without first untying the knots.  This is what will happen to your muscle fibers if you stretch without first releasing the spasms.

flexibility dvdI’ve worked for years with people who not only have sore shoulder pain, but also have pain in every joint. Frequently pain is caused by repetitive muscle strain while working or playing sports and it needs to be released. Working with athletes it was vital to teach them how to do self-treatments they could use during a race or competition. And my other clients have found self-treatments give them permanent relief from aches and pains.

This has led to several books and DVD programs, including Focused Flexibility Training.  On one DVD I demonstrate how to self-treat every muscle, from your head to foot. And then, on two DVDs (1 Upper Body and 1 Lower Body) Ana Johnson, a fantastic yoga instructor, leads you through self-treating the muscles you will be stretching followed by a 30-minute yoga program.  It works to quickly eliminate a painful shoulder, as well as pain and stiffness throughout your body.

pain free dvdFocused Flexibility Training has a foundation of self-treatments that come from my book, Treat Yourself to Pain-Free Living. The exciting part is people from all over the world have confirmed that the treatments really work!

There are several treatments for sore shoulder pain. Each addresses a different group of muscles that move your shoulder and arm. There are uncountable motions you make every day without even thinking about it, and each muscle can be strained.

Treatment for a Painful Shoulder

shoulder pain treatmentThe photo to the left show you how to treat your infraspinatus muscle. This muscle brings your shoulder back, like you’re taking a tennis serve. When your Infraspinatus muscle is in spasm, it causes shoulder pain as you try to bring your arms forward.

Place the Perfect Ball as shown in the picture, and lean your weight into the ball.  Look for the “hot spot,” which will be tender.  As you lean into the ball take the pressure off, and then lean again. You’ll find the painful shoulder becoming less and less painful each time you again add pressure.

Move the ball to different areas of your shoulder, finding the various painful points.  Each one is a spasm that is causing your sore shoulder pain. You can enhance this treatment by slowly drawing your arm across your body while you are still pressing into the ball. Since the spasms have been released, this movement will safely stretch the muscle fibers. As you release each spasm, and then stretch, you’ll find pain relief and you’ll know how to stop pain quickly and easily should it return.

As for the man mentioned at the beginning of this blog, I taught him how to do the self-treatments.  I’m happy to say that today he told me he slept through the night for the first time in weeks. He’s getting better every time he does the self-treatments and he’s back to sailing again.  That is so fulfilling — I LOVE my work!

With some knowledge of how to find spasms, how to self-treat them, and how to stretch properly, you can Stop Pain FAST!  This, of course, goes for a painful shoulder as well.

Wishing you well,

Julie Donnelly

julie donnellyAbout The Author

Julie Donnelly is a Deep Muscle Massage Therapist with 20 years of experience specializing in the treatment of chronic joint pain and sports injuries. She has worked extensively with elite athletes and patients who have been unsuccessful at finding relief through the more conventional therapies.

She has been widely published, both on – and off – line, in magazines, newsletters, and newspapers around the country. She is also often chosen to speak at national conventions, medical schools, and health facilities nationwide.

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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