Are Toxic Chemicals Lowering Our IQ?

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

Is Chemical Brain Drain A Pandemic?

 Author: Dr. Stephen Chaney

In a past issue of “Health Tips From the Professor” I examined the evidence suggesting that toxic chemicals in the home could cause childhood asthma. That is alarming because asthma can predispose individuals to other diseases and affects quality of life.

Confused ChildBut, what if that were only the tip of the iceberg? For example, a recent headline stated: “More Toxic Chemicals [In Our Environment] Are Damaging Children’s Brains”. If that headline is true, it’s downright scary.

The authors of this study suggested that toxic chemicals which are abundant in our environment can cause decreases in IQ and aggressive or hyperactive behavior in children – and that those changes may be permanent.

The Study Behind The Headlines

The paper that generated the headlines (Grandjean & Landrigan, The Lancet Neurology, 13: 330-338, 2014) was a review of the literature, not an actual clinical study.

Based on published clinical studies, the authors identified 12 chemicals commonly found in the environment as developmental neurotoxins (toxins that interfere with normal brain development) based. [If you would like to find out what those “Dirty Dozen” chemicals are and where they are found, click here.]

This finding compares with 6 developmental neurotoxins that they were able to identify in a similar study in 2006.

The authors were not claiming that the number or amount of toxic chemicals changed between 2006 and 2014. They were saying that science has advanced to the point where we can classify six more chemicals that have been in our environment for years as developmental neurotoxins.

Even more worrisome, the authors postulate that many more environmental neurotoxins remain undiscovered.

Are Toxic Chemicals Lowering Our IQ?

To answer that question, you need to look at some of the studies they cited in their review. For example:

  • Elevated blood lead levels in children are associated with as much as a 7 point decrease in IQ (Lamphear et al, Environmental Health Perspectives, 113: 894-899, 2005).
  • Elevated fluoride levels in drinking water are also associated with as much as a 7 point decrease in IQ (Choi et al, Environmental Health Perspectives, 120: 1362-1368, 2012).

The effects of many of the toxic chemicals on IQ were difficult to quantify, but the authors estimated that exposure of US children to just 3 of the chemicals (lead, methymercury and organophosphate pesticides) was sufficient to lower their average IQ by 1.6 points.

What Are The Potential Consequences?

The authors spoke of the environmental neurotoxins they identified as representing a “silent pandemic of a chemical brain drain” that could cost the US economy billions of dollars.

One of the blog posts I read on this topic summarized the consequences in a very graphic manner. It said:

If one child’s IQ is reduced by 5 points, it doesn’t appear to make a big difference.  For example, that child might be:

  • A little slower to learn
  • A little shorter of attention
  • A little less successful at tests and at work

That might result in $90,000 in lost lifetime earnings

However, if the average IQ of every child in the US were decreased by 5 points, the effect becomes significant:

  • Only half as many members of the next generation would be “intellectually gifted”.
  • Twice as many of the next generation would be “intellectually impaired”
  • Lost productivity could be in the billions

Of course, statements like that are a bit over the top. Drs. Grandjean and Landrigan did not claim that the net effect of the chemicals they identified was a 5 point drop in IQ. Nor did they claim that all US children were affected equally.

Still, it’s enough to make you think.

Are Toxic Chemicals Causing Behavior Problems?

Angry boy portraitThe authors cited numerous studies linking the chemical neurotoxins they identified to aggression and hyperactivity. But perhaps the most compelling reason to suspect that environmental chemicals may be affecting brain development is the spiraling incidence of developmental disorders such as autism and ADHD. For example:

  • Autism has increased by 78% since 2007 and now affects 1 of 88 eight year old children.
  • ADHD has increased by 43% since 2003 and now affects 11% of children age 4-17.

Some of this increase could be due to better diagnosis of these conditions, but nobody believes that all of it is due to improved diagnosis. The authors claim that much of this increase is likely due to environmental exposure to the kinds of developmental neurotoxins they identified.

Is The Science Solid?

This is a difficult area of research. You can’t do the gold standard double-blind, placebo-controlled clinical trial. Nobody in their right mind would give one group of children toxic chemicals and the other group a placebo.

The studies cited in this paper were mostly population studies. Basically this means that they compared children with exposure to certain toxic chemicals to a control group that was as similar as possible to the first group except that their exposure to the toxic chemicals was less.

The limitation of this kind of study is obvious. We are usually comparing children from different locations or of different backgrounds. We almost never know if we have controlled for all possible variables so that the groups are truly identical.

As a consequence it becomes important to ask how many studies come to the same conclusion. For some of the toxic chemicals, such as lead, methymercury and organophosphate pesticides, the weight of evidence is very strong. For some of the newer additions to their list of developmental neurotoxins, it is pretty clear that the chemicals have neurotoxic properties, but the significance of those effects on the developing human brain are hard to quantify at this point.

The Bottom Line:

1)     A recent review claims that there is a good scientific basis for classifying at least 12 environmental chemicals as developmental neurotoxins that are likely to reduce IQ and contribute to behavioral problems in US children. [If you would like to find out what those “Dirty Dozen” chemicals are and where they are found, click here.]

2)     The science behind the claims in this review is solid, but not iron-clad.

3)     However, there are times when we need to simply ask ourselves: “What if it were true?” The consequences of lowered IQ and developmental behavioral problems are so significant that it may not make sense to wait until we have unassailable scientific evidence before we act.

4)     We all need to be guardians of our personal environment. But, it is not easy. The “Dirty Dozen” chemicals identified in this study come from many sources:

  • Some are industrial pollutants. For those, we need lobby for better environmental regulation.
  • Some are persistent groundwater contaminants. For those we need to drink purified water whenever possible.
  • Some are insecticides and herbicides used in agriculture. For those we need to buy organic, locally grown produce when feasible.
  • Some are found in common household products and furnishings. For those we need to become educated label readers and use non-toxic products in our home whenever possible.

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

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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