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Monday, April 03, 2006

Autism and Mercury

The dangers of mercury in our environment has made the news in several ways with mercury in dental filings and mercury in seafood perhaps the most prominent. Less known, especially among young parents is the danger of mercury in childhood vaccines. From Autism: A Unique Type of Mercury Poisoning:

Autism is a syndrome characterized by impairments in social relatedness, language and communication, a need for routine and sameness, abnormal movements, and sensory dysfunction. Mercury (Hg) is a toxic metal that can exist as a pure element or in a variety of inorganic and organic forms and can cause immune, sensory, neurological, motor, and behavioral dysfunctions similar to traits defining or associated with autism. Thimerosal, a preservative frequently added to childhood vaccines, has become a major source of Hg in human infants and toddlers


The potential danger is further explained here:

Thimerosal, a preservative in vaccines that is 49 percent ethyl mercury, was a major source of mercury exposure from 1988 through 2002 when it was removed from childhood immunizations at the urging of the Public Health Service and the American Academy of Pediatrics
One should be aware that stocks of pre-2002 vaccines may still exist and to be sure to question medical personal about vaccine content before submitting to a vaccination. Those getting flu shots or any other type of vaccines should exercise the same precaution.

Some medical personnel may suggest that the mercury in vaccines is safe and within government standards. But is any amount of mercury safe?. Since mercury used to be used in various electrical switches because of its conductive characteristics, I was personally aware that even casual contact with mercury was to be avoided. From Even safe mercury levels harm brain


LEVELS of mercury currently regarded as safe for adults could impair brain function, according to a study in Brazil. The study has been dismissed as too small to be conclusive, but if it is right, mercury could be slightly reducing the mental performance of millions of people worldwide.

Low levels of mercury are already thought to damage the nervous systems of fetuses and babies. After a study in the Faroe Islands showed that children exposed to mercury in the womb have memory, attention and language problems at age seven, regulatory authorities in the US and UK advised pregnant and nursing mothers not to eat large predatory fish such as tuna, shark and king mackerel. Mercury and methyl mercury (a more toxic form generated by bacteria) are most concentrated in animals near the top of the food chain.
Can anything be done to reverse the affects of mercury?

From a previous article :

This impairment (autism) manifests as a severe imbalance in the ratio of active to inactive glutathione, the body's most important tool for detoxifying and excreting metals. Glutathione works as an antioxidant, keeping in check the potentially destructive process of oxidative stress caused both by normal metabolism and environmental contaminants. Autistic children showed a significant impairment in every one of five measurements of the body's ability to maintain a healthy glutathione defense.

Glutathione is one of the body's most important mechanism of heavy metal detoxification and excretion. Some metals—copper, chromium, iron and vanadium—directly provoke oxygen radical formation. Glutathione binds with these compounds as well as other metals—cadmium, lead, mercury, and nickel (Stohs 1995). The resulting, water-soluble chemical is more easily filtered out of the body.


Since the opportunity for mercury and other metal ingestion is so available in today's environment a daily supplement of glutathione might be advisable for all.

Comments

Avatar for realitybasedbob

Thanks for that info, doc. Did you know this about our current administration:

MERCURY RISK OVERSTATED, HOUSE PANEL SAYS

Dangers of toxic mercury pollution in the environment have been overstated, according to a House Resources Committee report issued in anticipation of new regulatory proposals from the Bush administration. The report, written by aides to the committee’s majority Republicans, also said no link between mercury from coal-burning power plants and levels of mercury in fish has been scientifically established. "After an exhaustive review of all the science surrounding the mercury debate, it is clear that some special-interest groups are crying wolf," said panel Chairman Richard Pombo (R-CA). The report comes in advance of changes to the U.S. Environmental Protection Agency’s regulations governing mercury from coal-burning power plants, expected by March 15…

 PAO > Policy News Updates >

The Environmental Protection Agency released its first mercury rule, which will mandate the use of a cap-and-trade system to control mercury emissions from power plants. EPA’s mercury plan formally rescinds a Clinton administration regulatory determination calling on EPA to require the installation of maximum achievable control technologies for mercury on nearly all of the nation’s 1,300 power plants. Instead, utilities will be allowed to either install emission control technologies or purchase credits that essentially allow them to do nothing. …The rule is almost certain to be challenged in court by critics of the Bush administration’s regulatory decisions. Many members of Congress are also critical, with 29 senators on record this year encouraging EPA to take a different regulatory route. Eleven moderate House Republicans formally criticized the mercury ruling in a letter to acting EPA Administrator Stephen Johnson, arguing the plan does not go far enough to protect public health and the environment…

PAO > Policy News Updates >

realitybasedbob on April 3, 2006 at 08:51 am

Thanks for that info, doc. Did you know this about our current administration:

What about it?

likwidshoe on April 3, 2006 at 09:04 am
Avatar for MH

Alot of this ‘data’ is put out by a group that is entirely convinced of this thimerosal-autism linkage.  Studies in the Netherlands that removed it in 1992 did not see decreased autism rates, but instead the trends matched what was seen in other countries that continued to have thimerosal in their vaccinations.  This is most likely due to increased awareness of the syndrome and diagnosis of it rather than a real increased incidence.  A hundred years ago, autism was not even a defined disease.  Does that mean it didn’t exist back then?  I don’t think so.

 Please don’t fall into the trap of believing these people.  Virtually no peer-reviewed journal has shown any real link here. 

MH on April 3, 2006 at 09:39 am
Avatar for Robert Perry

Actually, there is some peer reviewed data just coming out that shows that rates of autism have declined as thimerosal has been removed from vaccines.

http://www.medicalnewstoday.com/medicalnews.php?newsid=38784

Now, as "Say Anything’s resident statistician," I’m pretty much obliged to note that we’re trying to get a handle on something that happens to fewer than 1000 children per year, and to get a statistically decent answer to "does mercury hurt us?" really requires sample sizes in the tens or even hundreds of thousands.  This, in turn, almost inevitably confounds the data with extra variables--requiring yet larger samples.

In other words, there are any number of things which really do matter that can never be caught in a standard medical study.

Robert Perry on April 3, 2006 at 10:21 am
Avatar for Samantha

Those who believe that mercury, specifically mercury in thimerosal in vaccines, causes autism need to explain a few things.

<ol><li>Why does autism often run in families?</li>

<li>Why does it affect boys far more than it does girls?<li>

<li>Why is it that in areas where pregnant women are exposed to high levels of mercury there is not also an increased rate of occurance of autism?</li>

<li>Why has the rate of autism diagnosis not fallen since the discontinuation of thimerosal use in childhood vaccinations?</li>

<li>Why is the rising rate of autism diagnosis attributed to mercury/thimerosal/vaccinations rather than the fact that there is an increased awareness of the condition and better healthcare availble to the general population?</li>

<li>Autism was first described before widespread childhood vaccinations and before thimerosal was used in those vaccines, how is that reconciled with the claim that mercury causes autism?</li></ol>

I could go on and on. I’ve done a lot of research on autism and possible causes and I find the arguments for mercury as the cause unconvincing. Valuable time and research dollars have been wasted trying to find a link between thimerosal/vaccines/mercury and autism. 

Samantha on April 3, 2006 at 10:45 am
Avatar for Robert Perry

Samantha, there is indication that autism rates have fallen rather dramatically as thimerosal has been removed from vaccines--see the link I provide above. 

Regarding your other questions,  the quick & easy answer to your questions is that most advocates only said that mercury/thimerosal was one cause, not the cause, and that thimerosal is metabolized differently than other sources of mercury. 

Robert Perry on April 3, 2006 at 11:06 am
Avatar for WOOF

Many states advise pregnant women and children not to eat fish caught in local waters.

A few cans of tuna a week can cause birth defects or  spontaneous abortion. 

WOOF on April 3, 2006 at 02:27 pm
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