You've probably heard many times about the potentially harmful
quantities of mercury in some types of fish. Fish that are highest on
the food chain accumulate the most mercury in their tissues, such as
shark, swordfish, marlin, tilefish, etc.
That's why most health
authorities warn of eating high mercury types of fish more than once a
month or so. Mercury toxicity is thought to cause many health problems
over time if we eat too much of these types of fish.
However, I
learned something interesting recently that I have to give credit to
expert health author, Chris Kresser... Chris pointed out some very
interesting research that shows that selenium basically protects your
body from mercury toxicity. Essentially, if the food is higher in
selenium than mercury, the selenium binds to the mercury and therefore
doesn't allow the mercury to bind to tissues in your body, such as the
brain.
According to University of North Dakota researcher
Nicholas Ralston, if the fish you eat contains more selenium than
mercury, this selenium will basically protect your body from absorbing
the mercury and you don't have to worry.
So the question remaining is...
Which types of fish contain more mercury than selenium, so we know to avoid those?
According to the Western Pacific Fishery Council, "regardless of the amount of mercury in fish, if the selenium level is higher, the fish is safe to eat".
The main types of fish that contain MORE mercury than selenium are some
types of shark, pilot whale, tarpon, marlin, and swordfish. Most other
ocean fish contain more selenium than mercury and therefore offer a
level of protection to you against the mercury contained in them.
What about freshwater fish?
Again,
I have to thank health author Chris Kresser for digging up this
research, but according to a study conducted by the Energy &
Environmental Research Center (EERC) and the EPA, approximately 97% of
freshwater fish from lakes, streams, and rivers in the western US are
safe to eat in terms of mercury to selenium ratio.
Now keep in
mind that PCBs and other chemicals may still be an issue with some types
of fish in localized polluted rivers or lakes. This varies widely based
on how clean each water body is in different areas. Local health
authorities would have information on the safety of eating fish caught
in local rivers and lakes in terms of PCBs and other pollutants.
However, this isn't the whole story just yet...
We
still need to discuss issues with fish oil, the omega 3 vs 6 topic,
farmed fish, and a few other issues. The video below is a MUST-watch
and discusses several important things:
1.
Issues with the fish oil that you might be taking currently. It turns
out that many fish oils you buy have become rancid and can actually
CAUSE inflammation in your body instead of fighting it. You'll see how
to avoid these harmful fish oils.
2. It will
discuss the 5 WORST cooking oils that are actually harming your skin,
joints, organs and causing runaway inflammation throughout your body.
3. It will discuss several other issues with certain types of fish and what you need to look out for.
4. Powerful tips to FIGHT inflammation in your body with specific nutrients
Never eat this type of fish (plus the type of fish oil CAUSING inflammation in your body)
To your health,
Mike Geary
Certified Nutrition Specialist
Certified Personal Trainer