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

How To Treat Tight Hamstrings

Posted March 21, 2017 by Dr. Steve Chaney

Stretching Hamstrings Can Cause Them To Tear

Author: Julie Donnelly, LMT – The Pain Relief Expert

Editor: Dr. Steve Chaney

 

how to treat tight hamstrings“Don’t stretch your hamstrings” is the opposite advice to that given to the vast majority of athletes, especially runners. There is good reason to stop before you stretch, and consider why your hamstrings feel tight in the first place before determining how to treat tight hamstrings.

I received a message about a hamstring injury on one of the forums that I moderate. The message came from a father who was concerned about his 12YO son, an avid athlete. While stretching his hamstrings, he heard a “pop” and immediately felt pain at his butt and behind his knee. A few days had passed and the boy was still having hamstring pain while sitting and walking.

The first thing someone may tell him is to stretch, and that’s the last thing that should be done. He needs to get an MRI to make sure that his hamstring tendon isn’t torn. If that’s okay, then he needs to look more in depth to find out why his hamstrings are tight.

Why Your Hamstrings May Be Overstretched

overstretched hamstringsVery often your hamstrings will feel tight even though they are actually being overstretched!  Your hamstrings originate on your posterior pelvis, and one of your quadriceps muscles originates on the front of your pelvis. The quadriceps muscle is Rectus Femoris which goes from your pelvis, over your kneecap and down to your shin bone.

When your Rectus Femoris is tight, it will pull your pelvis down in the front. This causes your pelvis to move up in the back, and your hamstrings get overstretched. Your hamstrings feel tight, but if you then try to stretch them, you could tear them. In fact, if they are tight enough, you could actually pull the tendon away from the bone.

I’ve found that your hamstrings will often release on their own when you treat your quadriceps. As your quadriceps aren’t pulling down on the front of your pelvis, it allows your posterior pelvis to go down. As your posterior pelvis goes down, it releases the over-stretch from your hamstrings.

How to Treat Tight Hamstrings

release quadricep tensionPay attention to tight quadriceps when deciding how to treat tight hamstrings.

Fortunately, it’s really easy to release the tension in your quadriceps. I teach these treatments, and many more, in my book: Treat Yourself To Pain-Free Living.

In this picture, I’m using the Julstro Power Roller to push (don’t roll) from the top of my thigh to just above my knee.

I’ve found that the Power Roller gives more focused strength than using a foam roller. Also, tools that have beads that roll can’t go deep enough to reach the lower fibers of this thick muscle.

You’ll find a big spasm, which feels like a bump, at the point shown in this picture. When you go over the spasm, it will hurt so start out slow and build up strength to go deeper.

Also, treating your quadriceps will not only help release your hamstrings, but it is also the treatment for knee pain. This helps you eliminate two painful conditions, not just one! This is also one of the series of treatments for releasing low back, hip, and groin pain. It’s an especially good self-treatment to learn. You can also do this treatment while sitting in a chair with your knee slightly bent.

 How to Treat Tight Hamstrings While Treating Spasms

treat tight hamstringsAFTER you treat your quadriceps, then you can treat your hamstrings. The picture on the left not only treats the spasms, but it also stretches your hamstrings.

I prefer the Julstro Perfect Ball  over any other type of ball.  The Perfect Ball is solid in the middle and soft on the outside, giving great pressure without hurting the muscle.

Put the Perfect Ball on a hard surface such as a wooden stool or corner of a desk.

Rest your hamstrings on top of the ball, moving until you find the spasm in the muscle.

Finish by straightening your leg which will stretch your hamstrings. Go slowly and don’t strain the muscle, just move to a “hurts so good” level.

pain free living bookTreat Yourself to Pain-Free Living  shows you how to treat spasms from your head to your feet. If you are in pain, or if you love sports and your joints feel tight, this book will become your favorite “tool!”

Now, you know how to treat tight hamstrings.

Wishing you well,

Julie Donnelly

 

About The Author

julie donnelly

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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