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Fish Fog

The link between fish consumption and neurobehavioral abnormalities in adults is likely related to mercury toxicity.

December 4, 2009 |
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Supplementary Info

Sources Cited


Image thanks to sonson.


Mercury affects adults too. Hair loss, memory loss, slurred speech. Here’s a case report of a guy who ate tuna every day—became so crazy he was thrown in a psych ward. Couldn’t even remember his name.
It’s not always this dramatic though. Eating fish gives people sub-clinical neurobehavioral abnormalities, meaning you feel fine, you look fine, but if you’re actually put to the test, the performance of those who eat fish is significantly worse on a bunch of tests, like finger tapping speed—like how fast you can do this. But if go up against your fish eating friends and win bets seeing who can tap faster, I get a cut.

To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring watch the above video. This is just an approximation of the audio contributed by veganmontreal.

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Dr. Michael Greger

Doctor's Note

Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out the companion video on mercury poisoning from maternal fish-eating. Also, there are1,449 other subjects covered in the rest of my videos--please feel free to explore them as well!

For more context, check out my associated blog post, Mercury Testing Recommended Before Pregnancy.

  • Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out the companion video on mercury poisoning from maternal fish-eating. Also, there are 1,449 other subjects covered in the rest of my videos–please feel free to explore them as well!

    • Juan Live

      J Ethnopharmacol. 2012 Feb 15;139(3):765-71. doi: 10.1016/j.jep.2011.12.010. Epub 2011 Dec 13.
      5α-reductase inhibition and hair growth promotion of some Thai plants traditionally used for hair treatment.

      check this thai plants inhibit 5 alpha red… hope it helps

  • zack

    Im just curious. You eat a healthy plant based diet (vegan) i assume, and usually the people that do have great hair health but ou seem to be balding. Is this a genetic thing or maybe exposure to something in your past?

    • Juan Live


  • Amit

    Dr. can olive oil using on scalp prevent DHT ? if yes, can it work so actively . Actually as you know revivogen a natural DHT inhabitor product which has omega3( i believe its derived from either flax seeds, olive oil or fish) plus it has alcohol which I think make it quite active along with zinc. revivogen is quite thin actually. it really works , I’ve found it incredible product but its costlier to me that is why I also bought hairmax comb also which is a one time investment but I believe I still miss revivogen.
    I want something topical, so I was searching what aleternative can be of revivogen, last week I used extra virgin olive in my hair at bedtime , trust me any kind of itching/ tigling which specially occurs after hairmax went away, i washed hair in the morning they were shiny like they had a life, though revivogen also does same work. I am just wondering can it really helpful using olive oil into scalp to stop DHT ?

    • barbarabrussels

      check out amla in smoothies or on scalp. Good luck.

    • dave

      to help stop DHT use saw palmetto herb good for both your hair and prostate, and fo-ti herb also good for hair and keeps it from graying.

  • Jenn

    Are there any studies you know of that show correlation between diet and alopecia? I could not find anything on this site or pub med, but I may have missed something!