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The Nutrition InvestigatorThe health and nutrition blog by Dr. Roc Ordman.

Are There Other Risks To High Doses Of Fish Oil?

by Roc (click here for full post)

Fish Oil Hazard and Hazard to Fish from eating them

Although fish oil has many virtues, it has been pointed out that like everything, too much may be hazardous. In Am. J. Clinical Nutrition 2001 73: 539-548, it was found that subjects containing high levels of fishoils, 9 capusles per day for 12 weeks, had lower levels of natural killer cells. The NK cell activity was fully restored 4 weeks after the dosage was discontinued. I note that this was printed in 2001, and no further report confirming this hazard been found.

However, natural killer cells are produced in response to inflammation signals in the body. Too much omega-6 produced unnecessasry inflammatory signals. So if fish oil prevents unnecessary inflammation, it is likely that NK cell levels decrease, and that is a good thing, as they are not necessary. Viewed this way, it is actually a benefit that fish oil preserves your immune system, saving NK cell multiplication for when they are needed, for instance in response to cancer.

On the other hand, one can consider the hazard to fish as a result of people eating them. Here is a list of endangered fish it is kind not to eat.

Fish not to eat

Here is a list of endangered fish posted by www.blueocean.org

Summer Flounder
Swordfish (Atlantic and Mediterranean)
Western Rock Lobster (Australia)
Yellowfin Sole (U.S and Canada)
Yellowfin Tuna, purse-seine-caught
Blue Crab
Bluefish (U.S. Atlantic)
Canned Tuna
Caribbean Spiny Lobster (Florida)
Icelandic Scallop
Mahimahi, longline-caught
New Zealand Tai Snapper Tai
Pacific Salmon (California, Oregon, and Washington) Sake, Ikura
Rainbow Trout (farmed)
Rockfish (Alaska)
Sea Scallop Hotate
Sharks (U.S.)
Snow and Tanner Crabs (U.S. and Canada)
Snow Crabs
Swordfish (Pacific)
Yellowfin Tuna
Yellowtail, U.S. Farmed Hamachi
Albacore Tuna
American Eel
Atlantic Flounders and Soles Hirame
Bigeye Tuna, longline-caught Maguro
Icelandic Cod
Octopus Tako
Queen Conch
Rockfish (U.S. West Coast)
Atlantic Bluefin Tuna Kuro maguro/Hon maguro
Atlantic Cod (U.S. and Canada)
Atlantic Halibut Hirame
Atlantic Salmon (farmed)
Caviar (Caspian Sea)
Caviar (wild-caught, North America)
Chilean Sea Bass
Most Freshwater Eel
Orange Roughy
Smooth and Black Oreos
Shrimp (farmed, imported) Ebi
Snappers Tai
Yellowtail, Japanese farmed Hamachi

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