"We were born to mothers who smoked and drank. Our cribs
were covered in lead-based paint. No child proof lids. No seat belts in cars.
Rode bikes with no helmets and still here we are." So sings Bucky Covington in
"A Different World", a ballad about how the way things used to be. If Mr.
Covington visited North Adams, Massachusetts,
he might have something to say about the recent spill of elemental mercury at
the Conte Middle School there. And he just might update
his song with a line like "We used to play with mercury. And our 21st birthday
we did live to see".
Yes, kids used to play with liquid mercury from broken
thermometers. But as we learned in Part 2 of this four-part series, inhalation
(not touch) is the primary method of exposure to this hazardous substance. So
what about ingestion? And what about the lunch lady's Bucky Covington-like
arguments that no one ever died from eating burnt fish sticks? Is school food really that bad for you?
Mercury in Fish
The U.S. Environmental Protection Agency
(EPA) has a great Web page called "What You Need to Know about Mercury in Fish
and Shellfish". Although, as the EPA reports, "nearly all fish and shellfish
contain traces of mercury," the agency notes that "for most people, the risk
from mercury from eating fish and shellfish is not a health concern." In
conjunction with the U.S. Food and Drug Administration (FDA), the EPA even
provides guidelines for the maximum amount of fish that different populations
can eat in a week.
But let's be clear about something. The
mercury in fish isn't the same as the substance that forced the closing of the Conte Middle
School. Although elemental mercury is
naturally-occurring, mercury is also an airborne industrial pollutant. When mercury falls
from the air, this substance accumulates in bodies of water and becomes
methylmercury. Fish that feed in these polluted waters accumulate methylmercury
in their tissues. Humans eat these fish and ingest this toxic substance. As the
EPA reports, "methylmercury is removed from the body naturally, but it make
take over a year for levels to drop significantly."
So what if you splurge on a second helping of
fish sticks or chow down a classroom sized can of tuna fish? If fish sticks (a staple of school
lunches) are your vice, then you probably don't have much to worry about. According
to the EPA, "fish sticks and 'fast-food' sandwiches are commonly made from fish
that are low in mercury." Canned tuna generally contains less mercury than tuna
steaks, so don't press the panic button if you're about to sprout gills. But avoid next week's tuna melt, especially if you're pregnant,
expecting to become pregnant, a nursing mother, or a young child.
The Potomac Two-Step
So how dangerous is mercury in fish?
Unfortunately, the answer sounds just like it came from our nation's capital
(which it did). In short, it depends - on who you are, what kind of fish you
eat, and how much you consume over a given period of time.
Editor's Note: Click here for the final installment in this series. Part 1, Part 2, and Part 3 are also on-line.
Resources:
http://www.elyrics.net/read/b/bucky-covington-lyrics/a-different-world-lyrics.html
http://www.epa.gov/waterscience/fish/advice/
------------------------------
Steve Melito
|
Comments rated to be "almost" Good Answers: