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Mercury Testing Before Pregnancy

Recent testing of mercury concentrations in three national brands of canned tuna found that “55% of all tuna examined was above the U.S. Environmental Protection Agency’s safety level for human consumption.” And the problem appears to be getting worse. Previous studies on canned tuna in 1993 and 2004 showed concerning levels of mercury contamination, but not as bad as it is now. See my profile of the paper in my 2-min. video Which brand of tuna has the most mercury?.

Given the average level of mercury pollution found in canned tuna, researchers suggest that your average 9-year-old would exceed the EPA limit even if they only ate a can of tuna every 6 weeks. They conclude: “These results indicate that stricter regulation of the canned tuna industry is necessary to ensure the safety of sensitive populations such as pregnant women, infants, and children.” Some question whether the federal safety limits are even sufficiently protective.

A recent review from researchers at Harvard and elsewhere on the adverse effects of mercury in fish proposed that the exposure limits set by the U.S. EPA suggested current regulations in the United States be cut in half. Already, current regulations in the United States allow up to 10 times as much mercury in fish as the EPA limit allows, and so our fish is allowed to have 20 times more mercury than may be considered safe.

Because the EPA safety limit on mercury in fish may not sufficiently protect pregnant women in the United States, a recommendation has been put forth that that fish-eating women may want to get tested for mercury before considering getting pregnant. It’s a simple test: since mercury basically contaminates our whole body, all they need is a hair sample. See more details in my 2-min. video Hair Testing for Mercury Before Consider Pregnancy.

Studies of children on the neurobehavioral toxicity of mercury suggest that no level of mercury exposure can truly be considered safe, but pressure from the fish industry may be preventing safety limits from dropping further. See what a whistle-blowing toxicologist had to say in today’s NutritionFacts.org video pick shown above.

Mercury is not just a problem for children. Mercury and other toxic pollutants in fish are thought to be the reason the consumption of dark fish (such as salmon, swordfish, bluefish, mackerel, and sardines) may increase one’s risk of atrial fibrillation, an irregularity of heart beat rhythm associated with stroke, dementia, heart failure, and a shortened lifespan. See my 2-min. video Red Fish, White Fish; Dark Fish, Atrial Fibrillation. Also check out Fish Fog, which discusses the link between fish consumption and neurobehavioral abnormalities in adults.

For more information on industrial pollutants in fish, see Xenoestrogens & Sperm Counts and Fish Intake Biomarker. There are also natural toxins that can bioaccumulate up the aquatic food chain. See my 2-min. video Amnesic Seafood Poisoning about a rare toxin called domoic acid. It can turn up in tuna and other seafood and can cause anterograde amnesia, the loss of short-term memory popularized in the movie Memento.

Even drugs can build up in fish. In my 1-min. video A Fine Kettle of Fluoxetine, I follow up on my earlier video Prozac Residues in Fish about the occurrence of pharmaceuticals and personal care products in fish fillets.

For more on canned tuna specifically, see Carcinogenic Putrescine, The Effect of Canned Tuna on Future Wages, Amalgam Fillings vs. Canned Tuna, and Mercury in Vaccinations vs. Tuna.

Fish aren’t the only source of toxic heavy metals, though. Mercury has been found in both high fructose corn syrup-containing products (see Mercury in Corn Syrup?) and Ayurvedic dietary supplements (see Get the Lead Out).

In health,
Michael Greger, M.D.

Image credit: veer66 / Flickr

Related:
Industrial Pollutants Measured in Vegans
Arsenic in Chicken & Brown Rice Syrup
Amalgam Fillings, Canned Tuna, & Mercury

Read more: Babies, Children, Diet & Nutrition, Food, Health, Obstetrics, Pregnancy, Videos, Women's Health, , , , , , ,

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Dr. Michael Greger

A founding member of the American College of Lifestyle Medicine, Michael Greger, M.D., is a physician, author, and internationally recognized speaker on nutrition, food safety, and public health issues. Currently Dr. Greger serves as the Director of Public Health and Animal Agriculture at The Humane Society of the United States. Hundreds of his nutrition videos are freely available at NutritionFacts.org.

32 comments

+ add your own
7:39AM PST on Jan 10, 2013

Thank you for sharing.

9:37PM PDT on Jun 24, 2012

Thanks.

6:21AM PDT on Jun 22, 2012

I don't believe in the mercury idea. Made up junk the same way all this nutrition crap is.

10:50PM PDT on Jun 21, 2012

Well that cans another food for us!

5:10PM PDT on Jun 21, 2012

I haven't had canned tuna is decades. Can't afford the fresh either.

5:01PM PDT on Jun 21, 2012

Thanks

5:01PM PDT on Jun 21, 2012

Thanks

1:41PM PDT on Jun 21, 2012

AS you say we know where the toxins are coming from. Stop the big industrial corps from dumping all this crap. Filters, new ways of doing old things. Yes it will cost them big. Better then this continued pollution.

1:26PM PDT on Jun 21, 2012

part 3 of my comment to Jane B -- or, if you have other health issues, more
international units (IUs) daily or as needed to adjust your body's blood 25-hydroxy
vitamin D level to 80 to 100 nanograms/milliliter (or 200 to 250 nanomoles/lliter).]

Provided the preceding steps are appropriately followed, a person should be able
to eliminate controllable sources of exposure (e.g., dental amalgam fillings, dietary
fish, Thimerosal-containing vaccines), reduce his or her body burden of mercury,
and by adding the appropriate level of supplements, reduce his or her body's retention
of any additional mercury.
Of course, this answer does not apply to all of the other possible toxins.
****************************************************************
* The information provided in this comment and any attachment thereto
*is just that -- information.
* It is not medical or legal advice and it does not require any specific action
*or actions.
* While the information is thought to be accurate, no representation is made
*as to the accuracy of the information posted other than it is my best under-
*standing of the facts on the date that this comment is posted.
* Everyone should verify the accuracy of information provided for themselves
*before acting on it.
****************************************************************

1:19PM PDT on Jun 21, 2012

part 2 of my comment to Jane B's remarks: mineral supplements to replace any of
the good minerals that chelation may also remove. USE that chelation protocol
until after a number of periods of chelation followed by the appropriate reduction
in mercury body burden indicate that your mercury body burden is in the "normal"
("low") region and the complete metals profiles for the urine you are excreting
at the end of a chelation cycle shows the near absence of other heavy metals and
a low level of mercury. ELSE/THEN, proceed to step "5".

5. Reduce your exposures to dietary mercury by removing most all fish, except
those with inherently lower levels (e.g., salmon) from your diet and adding
other dietary supplements to get the omega-3 fatty acids you need.

6. As appropriate, add the following supplements to your diet to increase your
production of intra-cellular glutathione (your body's natural heavy-metal
detoxifying agent and antioxidant) [though you will need to consult the
literature to determine the appropriate levels of each for yourself, a
suggested LOW starting daily dose is provided]:
a. alpha-lipoic acid (ALA) [100 milligrams],
b. l-methionine [500 milligrams],
c. l-cystein (the dimeric readilably absorbable form of l-cysteine) [500 milligrams] &
d. in some instances, glutamine [250 milligrams].
[Also, increase your vitamin D-3 intake to 5,000 or, if you have

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