Quick Search
Categories
Recommended Reading:
|
A Government Big Enough to Supply Everything You Need is Big Enough to Take Everything You Have... The Course of History Shows That as a Government Grows, Liberty Decreases. ~ Thomas Jefferson |
|
You may find links that lead to
interesting information, or there
may be links to undesirable sites.
If you find any of these undesirables,
PLEASE let us know the URLs so
we can block them from our campaign. |
Mercury In Your Fish
Fish is beyond compare as a source of many nutrients vital to the developing infant, some of which may actually enhance development of the nervous system in babies and young children.
Widespread contamination of fish with toxic mercury, however, has cast a shadow over the nutritional benefits of fish.
Exposure to mercury in the womb can cause learning deficits, delay the mental development of children, and cause other neurological problems. Mercury consumed by a pregnant woman through contaminated fish can cross her placenta to damage the brain of her baby.
As a National Academy of Sciences panel definitively warned last year, some children exposed in utero by their mothers' fish consumption are at risk of falling in the group of children "who have to struggle to keep up in school and who might require remedial classes of special education."
Combustion in power plants of coal containing mercury is the major source of environmental pollution.
40 Tons of Mercury are released into the US EVERY year by this method.
Mercury pollution from coal-fired power plants moves through the air, is deposited in water and finds its way into fish, accumulating especially in fish that are higher up the food chain. Fish like tuna, sea bass, marlin and halibut show some of the worst contamination, but dozens of species and thousands of water bodies have been seriously polluted.
As a result, women who eat a lot of fish during pregnancy, or even as little as a single serving of a highly contaminated fish, can expose their developing child to excessive levels of mercury. The toxic metal can cross the placenta to harm the rapidly developing nervous system, including the brain.
In this report, EWG researchers for the first time attempt to characterize just how common such exposures are in the U.S. population, and the associated risks.
One key to the analysis is a much more refined representation of differences among women - their size, metabolism of mercury, blood volume, and many other biological variables. Government assessments use "averages" or constants for all of these factors, missing profound differences across the population of women of child bearing age.
EWG analysts also assembled the most extensive database ever developed on mercury levels in various species of fish, drawing on federal, state and other government sources, some 56,000 records in all.
That exercise revealed major variations in mercury contamination across fish species, yielding vital, highly practical information women can use while pregnant to reduce mercury exposure dramatically, while still enjoying the nutritional benefits of fish.
Earlier this year, the Food and Drug Administration came up with its own list of fish that pregnant and nursing women, along with infants, should avoid. Based on our analysis of much more extensive fish contamination records, the list presented in this report is more complete.
By analyzing these two data sources in combination, the study is able to provide new insights into how women can avoid excessive mercury exposures during pregnancy.
Researchers at US PIRG Education Fund, co-authors of this study, made another vital contribution. PIRG painstakingly combed through hundreds of "fish advisories" issued by state agencies to warn people about mercury levels in sport and game fish in literally thousands of US lakes and rivers.
What they found is disturbing: while some states are doing a better job than others, virtually no fish advisories for mercury contamination are adequately protective of human health when judged against current scientific knowledge.
The importance of this new understanding about mercury risks was evidenced in a landmark study on blood levels of mercury and other toxins, released by the federal Centers for Disease Control and Prevention (CDC) in March, 2001.
While "average" blood mercury levels among women were not of concern, the data indicate that in fully 10 percent of American women -- roughly 7 million women -- mercury levels were above the dose that may put a fetus at risk for adverse nervous system effects.
Those women surely don't need more mercury in their system, least of all if they are already pregnant or nursing. As this report recommends, the government must start monitoring such exposures, and any possible effects, much more energetically. This is a simple, common sense matter of public health.
In the longer term, the solution is to halt mercury pollution from coal-burning power plants and other sources so the contamination of fish is avoided in the first place. Fuel switching -- from coal to renewable energy sources -- along with aggressive deployment of conservation measures, makes sense for any number of reasons.
Fish free of mercury -- the way they used to be -- is just another one.
Executive Summary
On January 12, 2001, government health officials issued new advisories warning women to limit fish consumption during pregnancy to avoid exposing their unborn children to unsafe levels of methylmercury.
Methylmercury can cross the placenta and cause learning deficits and developmental delays in children who are exposed even to relatively low levels in the womb. The principal exposure route for the fetus is fish consumption by the mother.
The Food and Drug Administration (FDA), which regulates commercially sold fish, recommends that pregnant and nursing women and young children not eat any shark, swordfish, tilefish, or king mackerel, but then recommends 12 ounces per week of any other fish.
The Environmental Protection Agency (EPA), which makes recommendations to states about safe mercury levels in sport fish, allows up to 8 ounces of any fish per week for pregnant women with no prohibitions on consumption of any individual fish caught recreationally.
These restrictions are steps in the right direction, but they need to be tightened significantly to adequately protect women and their unborn children from the toxic effects of methylmercury.
The nutritional benefits of fish complicate the task faced by health officials when protecting the public from methylmercury. Protein, omega-3 fatty acids, Vitamin D, and other nutrients make fish an exceptionally good food for pregnant mothers and their developing babies.
At the same time, there is no doubt that methylmercury is toxic to the fetal brain and nervous system, and that many beneficial fish species are contaminated. EPA's safe exposure estimate for methylmercury has dropped twice in the past 16 years, as new science has identified adverse effects in children exposed in the womb at lower and lower doses.
Emerging evidence indicates that the safe dose may drop even lower in the future (NAS 2000). Just how long a fetus can tolerate a dose of methylmercury above a "safe level' with no observable adverse effects is a matter of ongoing debate.
Compounding this uncertainty is the lack of effective education and outreach to pregnant women about methylmercury risks and the near total absence of information for pregnant women on the levels of mercury in the fish they buy. New data from the Centers for Disease Control and Prevention (CDC) show that about 10 percent of all women of childbearing age have blood methylmercury levels above the dose that may put their fetus at risk for adverse neurological effects (CDC 2001).
If these women were to increase their consumption of certain fish species in hopes of benefiting their babies during pregnancy, they could expose their fetuses to potentially hazardous levels of methylmercury.
FDA's Protections Fall Short
FDA's methylmercury safeguards are designed to protect an average-sized woman eating an average fish contaminated with an average amount of methylmercury that decays in her body at an average rate. These assumptions rarely apply to the risks faced by any individual.
Instead, risks are unevenly distributed throughout the population, with a small but significant number of pregnancies exposed to far higher and potentially unsafe levels of methylmercury than the average fetus. The 10 percent most-heavily exposed American women already have blood methylmercury levels that would increase health risks to their fetuses if they became pregnant (CDC 2001). FDA's health advisory, based on average exposures, does little to protect these children.
The Environmental Working Group assessed fetal exposure to methylmercury taking into account a host of real world differences in individual exposure, including a mother's body weight and blood volume, varying methylmercury absorption and distribution rates, and variable rates of methylmercury decay in different pregnant women (Stern 1997, CDC 2001, NAS 2000).
These biological differences were matched up with a unique database of fish contamination that contains 56,000 records of methylmercury test results from seven different government sources. Fish consumption, fish contamination levels, and biological variables were matched thousands of times to create a distribution of blood methylmercury levels in women similar to that occurring in the general population.
This distribution was compared to the benchmark dose of methylmercury recommended by the Committee on the Toxicological Effects of Methylmercury of the National Academy of Sciences (NAS 2000).
FDA's recommendation of 76 6-ounce fish meals during pregnancy could actually be detrimental to the health of unborn children. Fish are an important part of a healthy diet and women should be encouraged to eat fish with low methylmercury levels during pregnancy.
But if American women ate a varied diet of FDA's recommended 12 ounces of fish a week (and none of the four prohibited fish) they would expose more than one-fourth of all babies born each year (1 million infants) to a potentially harmful dose of methylmercury for at least one month during pregnancy.
About 20,000 of these children would be exposed to a dose of methylmercury that increases the risk of adverse neurological effects for the entire pregnancy.
Widespread contamination of fish with toxic mercury, however, has cast a shadow over the nutritional benefits of fish.
Exposure to mercury in the womb can cause learning deficits, delay the mental development of children, and cause other neurological problems. Mercury consumed by a pregnant woman through contaminated fish can cross her placenta to damage the brain of her baby.
As a National Academy of Sciences panel definitively warned last year, some children exposed in utero by their mothers' fish consumption are at risk of falling in the group of children "who have to struggle to keep up in school and who might require remedial classes of special education."
Combustion in power plants of coal containing mercury is the major source of environmental pollution.
40 Tons of Mercury are released into the US EVERY year by this method.
Mercury pollution from coal-fired power plants moves through the air, is deposited in water and finds its way into fish, accumulating especially in fish that are higher up the food chain. Fish like tuna, sea bass, marlin and halibut show some of the worst contamination, but dozens of species and thousands of water bodies have been seriously polluted.
As a result, women who eat a lot of fish during pregnancy, or even as little as a single serving of a highly contaminated fish, can expose their developing child to excessive levels of mercury. The toxic metal can cross the placenta to harm the rapidly developing nervous system, including the brain.
In this report, EWG researchers for the first time attempt to characterize just how common such exposures are in the U.S. population, and the associated risks.
One key to the analysis is a much more refined representation of differences among women - their size, metabolism of mercury, blood volume, and many other biological variables. Government assessments use "averages" or constants for all of these factors, missing profound differences across the population of women of child bearing age.
EWG analysts also assembled the most extensive database ever developed on mercury levels in various species of fish, drawing on federal, state and other government sources, some 56,000 records in all.
That exercise revealed major variations in mercury contamination across fish species, yielding vital, highly practical information women can use while pregnant to reduce mercury exposure dramatically, while still enjoying the nutritional benefits of fish.
Earlier this year, the Food and Drug Administration came up with its own list of fish that pregnant and nursing women, along with infants, should avoid. Based on our analysis of much more extensive fish contamination records, the list presented in this report is more complete.
By analyzing these two data sources in combination, the study is able to provide new insights into how women can avoid excessive mercury exposures during pregnancy.
Researchers at US PIRG Education Fund, co-authors of this study, made another vital contribution. PIRG painstakingly combed through hundreds of "fish advisories" issued by state agencies to warn people about mercury levels in sport and game fish in literally thousands of US lakes and rivers.
What they found is disturbing: while some states are doing a better job than others, virtually no fish advisories for mercury contamination are adequately protective of human health when judged against current scientific knowledge.
The importance of this new understanding about mercury risks was evidenced in a landmark study on blood levels of mercury and other toxins, released by the federal Centers for Disease Control and Prevention (CDC) in March, 2001.
While "average" blood mercury levels among women were not of concern, the data indicate that in fully 10 percent of American women -- roughly 7 million women -- mercury levels were above the dose that may put a fetus at risk for adverse nervous system effects.
Those women surely don't need more mercury in their system, least of all if they are already pregnant or nursing. As this report recommends, the government must start monitoring such exposures, and any possible effects, much more energetically. This is a simple, common sense matter of public health.
In the longer term, the solution is to halt mercury pollution from coal-burning power plants and other sources so the contamination of fish is avoided in the first place. Fuel switching -- from coal to renewable energy sources -- along with aggressive deployment of conservation measures, makes sense for any number of reasons.
Fish free of mercury -- the way they used to be -- is just another one.
Executive Summary
On January 12, 2001, government health officials issued new advisories warning women to limit fish consumption during pregnancy to avoid exposing their unborn children to unsafe levels of methylmercury.
Methylmercury can cross the placenta and cause learning deficits and developmental delays in children who are exposed even to relatively low levels in the womb. The principal exposure route for the fetus is fish consumption by the mother.
The Food and Drug Administration (FDA), which regulates commercially sold fish, recommends that pregnant and nursing women and young children not eat any shark, swordfish, tilefish, or king mackerel, but then recommends 12 ounces per week of any other fish.
The Environmental Protection Agency (EPA), which makes recommendations to states about safe mercury levels in sport fish, allows up to 8 ounces of any fish per week for pregnant women with no prohibitions on consumption of any individual fish caught recreationally.
These restrictions are steps in the right direction, but they need to be tightened significantly to adequately protect women and their unborn children from the toxic effects of methylmercury.
The nutritional benefits of fish complicate the task faced by health officials when protecting the public from methylmercury. Protein, omega-3 fatty acids, Vitamin D, and other nutrients make fish an exceptionally good food for pregnant mothers and their developing babies.
At the same time, there is no doubt that methylmercury is toxic to the fetal brain and nervous system, and that many beneficial fish species are contaminated. EPA's safe exposure estimate for methylmercury has dropped twice in the past 16 years, as new science has identified adverse effects in children exposed in the womb at lower and lower doses.
Emerging evidence indicates that the safe dose may drop even lower in the future (NAS 2000). Just how long a fetus can tolerate a dose of methylmercury above a "safe level' with no observable adverse effects is a matter of ongoing debate.
Compounding this uncertainty is the lack of effective education and outreach to pregnant women about methylmercury risks and the near total absence of information for pregnant women on the levels of mercury in the fish they buy. New data from the Centers for Disease Control and Prevention (CDC) show that about 10 percent of all women of childbearing age have blood methylmercury levels above the dose that may put their fetus at risk for adverse neurological effects (CDC 2001).
If these women were to increase their consumption of certain fish species in hopes of benefiting their babies during pregnancy, they could expose their fetuses to potentially hazardous levels of methylmercury.
FDA's Protections Fall Short
FDA's methylmercury safeguards are designed to protect an average-sized woman eating an average fish contaminated with an average amount of methylmercury that decays in her body at an average rate. These assumptions rarely apply to the risks faced by any individual.
Instead, risks are unevenly distributed throughout the population, with a small but significant number of pregnancies exposed to far higher and potentially unsafe levels of methylmercury than the average fetus. The 10 percent most-heavily exposed American women already have blood methylmercury levels that would increase health risks to their fetuses if they became pregnant (CDC 2001). FDA's health advisory, based on average exposures, does little to protect these children.
The Environmental Working Group assessed fetal exposure to methylmercury taking into account a host of real world differences in individual exposure, including a mother's body weight and blood volume, varying methylmercury absorption and distribution rates, and variable rates of methylmercury decay in different pregnant women (Stern 1997, CDC 2001, NAS 2000).
These biological differences were matched up with a unique database of fish contamination that contains 56,000 records of methylmercury test results from seven different government sources. Fish consumption, fish contamination levels, and biological variables were matched thousands of times to create a distribution of blood methylmercury levels in women similar to that occurring in the general population.
This distribution was compared to the benchmark dose of methylmercury recommended by the Committee on the Toxicological Effects of Methylmercury of the National Academy of Sciences (NAS 2000).
FDA's recommendation of 76 6-ounce fish meals during pregnancy could actually be detrimental to the health of unborn children. Fish are an important part of a healthy diet and women should be encouraged to eat fish with low methylmercury levels during pregnancy.
But if American women ate a varied diet of FDA's recommended 12 ounces of fish a week (and none of the four prohibited fish) they would expose more than one-fourth of all babies born each year (1 million infants) to a potentially harmful dose of methylmercury for at least one month during pregnancy.
About 20,000 of these children would be exposed to a dose of methylmercury that increases the risk of adverse neurological effects for the entire pregnancy.
|
The Aim of Public Education is Not to Spread Enligtenment at All; It is Simply to Reduce as Many Individuals as Possible to the Same Safe Level, to Breed a Standard Citizenry, to Put Down Dissent and Originality. ~ HL Mencken |
|
The Cure for Health Care and Indigenous Power is to Remove the AMA and FDA, and Unleash the Power and Creativity of the Free Market. Many People Have Been Brainwashed into Thinking the State Protects Them. The Truth is the Exact Opposite. ~ Morris Fishbein |
|
You may find links that lead to
interesting information, or there
may be links to undesirable sites.
If you find any of these undesirables,
PLEASE let us know the URLs so
we can block them from our campaign. |