Doctor's Note

This is the last of a three-part video series on the latest on the risks of mercury in fish. For parts one and two, see Nerves of Mercury and Hair Testing for Mercury Before Considering Pregnancy. For more on the effects of mercury in fish on adults, check out Fish Fog. For more videos on canned tuna, see Carcinogenic PutrescineThe Effect of Canned Tuna on Future WagesAmalgam Fillings vs. Canned Tuna; and Mercury in Vaccinations vs. Tuna

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  • Michael Greger M.D.

    This is the last video of a three-part series on the latest on the risks of mercury in fish. See yesterday’s video-of-the-day Nerves of Mercury and Hair Testing for Mercury Before Consider Pregnancy for parts 1 & 2. For more on the effects of mercury in fish on adults, check out Fish Fog. For more videos on canned tuna, see Carcinogenic Putrescine, The Effect of Canned Tuna on Future Wages, Amalgam Fillings vs. Canned Tuna, and Mercury in Vaccinations vs. Tuna. And then there are a thousand other topics other I cover!

    • dont eat any fish

      You have to play go fish with your canned fish. I’d rather not touch the stuff.

  • HemoDynamic, M.D.

    Such a great series!  So much so that I just wrote the ACOG (American College of Obstetrics and Gynecology) about their current recommendations to eat fish to pregnant mother’s and linked five of your well cited videos to help them review the incontrovertable research.  Will they change their guidelines?  I wrote to their liability department–maybe, we’ll see ;-}
    Keep up the great work!!

  • Jnaselli

    So, which brand DID have the most mercury? Are you allowed to post that publicly? Is there a brand that had less?

    • DrDons

       They did not disclose brands. I’m sure there is variation between brands but the issue is mute since there is no way to know how much mercury there is in what you are eating. Since mercury is such a toxic substance to nerves, heart and immune system  it is wise to avoid intake of all fish products. For a little perspective see By going on a plant based diet with no fish consumption you will have much less mercury in your body see More information can be obtained by watching the other 17 videos on mercury and diet.

  • Stefan Juhl M.D.

    So full of metal that tuna soon wont need a can………

    • HemoDynamic, M.D.

      Exactly!  The Tuna will already be canned in the ocean (Canned at the source) and the Canner’s will be canned from their jobs!  It’s uncanny how candid I can be ;-}

      • Clarissa Harings

        Hahaha xD

  • troy

    I take vegan sourced DHA supplements, which can be hard to find (at least in Australia, where fish oil is *heavily* marketed).  It would be interesting if someone conducted a study into the level of heavy metals in fish oil or fish-sourced DHA supplements.

    • HemoDynamic, M.D.

      Why eat fish when you can eat a toxin free, renewable resource of Omega 3– Flax Seed!!
      Avoid the pillaging (Pill-Aging–see Dr. Gregers video, ) of our oceans, streams, and waterways and go Plant-Strong!   This would save yourself a lot of money that you could spend on a vacation to “shoot” the fish with your camera.  Go-Pro not Pro-zac!!

    • HemoDynamic, M.D.

      They have conducted studies: does just that and reports to the FDA, which is probably not saying much. However, they do list the products that they test as being free or not free of Heavy Metals, Dioxins, Freshness, Quality and Amount of EPA an DHA.  And they provide articles with researched information.  They do charge $40 per year to access their information.  Maybe their information is somehow biased but I don’t see that on the surface.
      Dr. Gregor, any info you can provide on the background of would be great.

  • Observer

    Need a little clarification about what’s “good” and what’s “bad.” I sometimes buy “Wild Planet” “wild albacore tuna (sashimi-grade)” (on Amazon) since they claim to be “less than half the mercury compared to conventional brands” and more n-3 fatty acid (2320mg DHA and 720mg EPA.)

    Now, I understand the mercury argument for not eating fish — but to simply ignore DHA and EPA n-3’s in exchange for a lower conversion (5%???) to long-chain n-3’s via ALA in flaxseed — just because fish is “animal cholesterol” and shouldn’t be eaten in the first place? The same argument (albeit in a lesser degree) can be made in reference to “grass-fed” animals since their n-3 count are higher than processed animals (and yes, due to their accumulation of plankton, grass, etc.)

    Disclaimer: I’m an evolutionary eater — not a vegetation, omnivore, pescatarian, etc. I like to avoid the artificial (corn flakes, nitrosamines, coloring, gmo’s) and eat what nature affords me — LIMITED animal fats and mostly plant-based foods — just like how nature intended.

  • Benubirdbc

    not helpful unless the brands are identified.

    • Clifford

      Agreed. The public has a right to know!

  • Also be sure to check out my associated blog post, Mercury Testing Recommended Before Pregnancy

  • Ronald Chavin

    In most longevity studies that I’ve seen, fish eaters live longer than vegans:

    Tuna fish are especially high in selenium, which binds with mercury to form a harmless selenium-mercury compound which is easily excreted by the body:

    Phytate in nuts, seeds, legumes, whole grains, and vegetables also binds with mercury, arsenic, lead, cadmium, beryllium, and barium to render them harmless:

    The Inuit (Eskimos) of Greenland have only 3 to 4 times as much mercury in their bodies, even though they consume about 100 times as much mercury, PCBs, and other marine pollutants as the average American. Although the Greenland Inuit are the world’s heaviest cigarette smokers and although their consumption of fruits and vegetables has been virtually zero until recently and although they add lots of salt when they eat their fish, seal meat/blubber, and whale meat/blubber, the Greenland Inuit have only half the age-adjusted total cancer death rate of Americans and cardiovascular disease is virtually nonexistent among the Greenland Inuit:

    The nations of the world with the longest life expectancies tend to be fish eating nations (Monaco, Macao, Hong Kong, Japan, Singapore, Iceland, Sweden, Norway, Australia, New Zealand, Canada, Spain, Andorra, France, and Italy):

    • Ronald Chavin

      Many years ago, researchers thoroughly investigated the Greenland Inuit for health defects which could be blamed on their diet of fish, seals, and whales. They discovered that the number of Greenland Inuit daughters substantially exceeded the number of Greenland Inuit sons. Researchers then decided that this was the only health defect that could be blamed on the Greenland Inuit’s incredibly high consumption of mercury, PCBs, and other marine pollutants. However, new research now indicates that vegans have this exact same problem too:
      The theory now is that vegetarian women and fish-eating women both have a preponderance of beneficial gut microbes (lactic acid bacteria) which cause weight loss and create acidic bodily pathways which somehow cause daughters to be born instead of sons.

    • Rich

      Finally some rational thinking on fish merits. I read these studies as well. You can still eat fish safely, just choose wisely. I select wild cold water salmon -short life span and much lower than mercury content. Since I am not expecting to conceive anytime soon, I’m not too worried about my brain shrinking.

    • Ronald J TekAno

      Good read..thou living years ago with the Eskimos and native indians, most over weight, generations of Coke and chips..the price of wholesome food is given up for booze…the monthly welfare checks go into the slot machines set up in local hotels! Mouth wash is banded in Yellowknife NWT as many locals get their highs from this product. We have distroyed the life nature of the northern people..sad gone..suicide rates highest in N. America..with global warming not much will remain for the natives in Northern Canada…Now residing in Thailand and enjoy a good diet here in Thailand…exercise daily and seldom go out to party..

  • Southlander

    Still want and/or need fish in your diet, Ditch the “tuna” period. Try “caned” SALMON which is “wild caught” and is lower on the food chain than tuna. Don and I CAN! :-))

  • y..

    What a useless video title, the question wasn’t even answered.

  • Robert Haile

    I have been treated for mercury toxicity and it is not pleasant. Tuna is no longer safe as most large fish like swordfish, shark, tilefish,etc..

  • Michael Routson

    I hear the Rock wwe wrestler eats 3lbs of fish everyday been doing it for years

  • Dr.Reuven Rosenberg

    How many cans of tuna equal the mercury in a single vaccination? Why does the mercury in vaccinations suddenly get a pass? They claim it’s a different form of mercury.