Does Fish Oil Cause Prostate Cancer?

This study was published the American Journal of Epidemiology this month.  It involves a study of the effects of omega-3 and omega-6 fatty acids on the risk of prostate cancer.  Omega-3 fatty acids, like those found in fish oil, are known to decrease inflammation, heart disease and cancer risk while omega-6 fatty acids and trans-fatty acids are pro-inflammatory and increase the risk of heart disease and cancers.  This was a subset of 3000 patients taken from the prostate cancer prevention trial.  In this subset of patients, 1/2 of them developed prostate cancer and 1/2 did not.  The researchers compared blood levels of omega-3 DHA as well as trans-fatty acids.  The main source for the omega-3 fatty acids in this trial was fatty fish, not fish oil capsules. 

What they found was perplexing.  The risk of aggressive prostate cancer was highest in the group of men who had the highest DHA levels.  Conversely, those with higher transfat levels, had a 50% decrease in the risk of aggressive prostate cancer.  Furthermore, neither fat affected the risk of low-risk prostate cancer.

These results are difficult to explain because of the known health benefits of omega-3 fatty acids.  They by no means prevent enough data to make recommendations to stop eating fatty fish or fish oil capsules.  Perhaps, since fish was the main source, mercury or some other toxin played a role in the findings of this study.   

We do know that another source of omega-3 fatty acids, flaxseed, has direct anti-prostate cancer effects.  So, I would recommend people continue taking fish oil capsules or eating fatty fish, as well as eating flaxseed every day.

Share this:
Share this page via Email Share this page via Stumble Upon Share this page via Digg this Share this page via Facebook Share this page via Twitter


  1. Despain A. Sailer said,

    May 24, 2011 @ 4:10 am

    Fascinating blog! Is your theme custom made or did you download it from somewhere? A design like yours with a few simple adjustements would really make my blog shine. Please let me know where you got your theme. Many thanks

  2. Dr. Bob Avery said,

    May 24, 2011 @ 9:42 pm

    My theme is twenty ten by WordPress.

  3. Signs of Cancer said,

    September 20, 2011 @ 1:59 pm

    With cancer being the 2 leading cause of death, I want to see it destroyed. I don’t know if this is completely possible, but we do have a starting place. We can learn and teach the signs and symptoms of cancer in order to achieve earlier diagnoses. Some cancers are curable if found soon enough. This is why I desire to teach the signs of cancer! Thank you for this site and please continue to teach!

  4. тайланд визы украина said,

    October 4, 2011 @ 9:01 pm

    Simple but interesting blog post I must say. I’ve just added your RSS to my google reader! =)

  5. Omega-3 fiskolja said,

    October 19, 2011 @ 5:44 pm

    I have been exploring for a bit for any high-quality articles or blog posts on this kind of area . Exploring in Yahoo I finally stumbled upon this site. Reading this info So i’m happy to exhibit that I have an incredibly just right uncanny feeling I came upon exactly what I needed. I most indubitably will make sure to do not fail to remember this site and give it a look regularly.

  6. gossip girl season 4 said,

    October 21, 2011 @ 11:14 pm

    Good day very cool blog!! Man .. Excellent .. Superb .. I will bookmark your web site and take the feeds additionally?I am glad to seek out a lot of useful info right here in the put up, we’d like develop extra techniques on this regard, thanks for sharing. . . . . .

  7. Dr. Bob Avery said,

    October 22, 2011 @ 12:42 pm

    thank you

  8. Columbus said,

    October 24, 2011 @ 7:00 pm

    Really good information! I have been seeking something like this for some time now. With thanks!

  9. Diana Dekorne said,

    October 31, 2011 @ 6:22 am

    Many thanks for making the effort to discuss this, I feel strongly about this and enjoy studying a great deal more on this topic. If possible, as you gain knowledge, would you mind updating your webpage with a great deal more details? It’s very beneficial for me.

  10. free forex trading signals said,

    November 2, 2011 @ 6:01 pm

    Could it be alright that will put thing about this in my small personal weblog if I post a reference to this webpage?

  11. Dr. Bob Avery said,

    November 2, 2011 @ 10:23 pm


  12. rheumatoid arthritis treatment said,

    November 4, 2011 @ 3:26 pm

    I have been exploring for a little for any high-quality articles or weblog posts on this kind of space . Exploring in Yahoo I finally stumbled upon this website. Reading this information So i am happy to convey that I have a very excellent uncanny feeling I came upon exactly what I needed. I so much indubitably will make certain to don?t disregard this site and give it a glance regularly.

  13. Sandra Krill said,

    January 26, 2012 @ 4:37 am

    Hi There Dr,
    Neat Post, Have you read any of the studies conducted over the last few years that have concluded with the findings that there is a possibility of a fish oil cure for prostate cancer? I know that the whole thing sounds far fetched, considering that billions of dollars have been spent on the research into effective cancer treatments. There couldn’t be such a simple answer to such a complex problem is probably what you are thinking.

  14. Turf said,

    January 26, 2012 @ 12:29 pm

    Thanks for this atricle. I would like to write something simular on my personal site. This is good idea so I might use it!

  15. said,

    May 6, 2012 @ 10:10 am

    Is it alright to put a portion of this on my personal site if perhaps I post a reference to this web-site?

  16. Dr. Bob Avery said,

    May 11, 2012 @ 1:56 pm

    yes, that would be fine.
    thanks for the interest

  17. tabatas said,

    May 14, 2012 @ 8:58 am

    I like your fantastic web site. Just what I was searching for!
    Best regards,

  18. sempak said,

    May 16, 2012 @ 5:27 am

    Does Fish Oil Cause Prostate Cancer? | Blog I was recommended this web site by my cousin. I’m not sure whether this post is written by him as nobody else know such detailed about my problem. You are wonderful! Thanks! your article about Does Fish Oil Cause Prostate Cancer? | BlogBest Regards Yoder

  19. P2P4U Football said,

    May 16, 2012 @ 10:16 am

    I must thank you for the efforts you’ve put in writing this blog. I’m hoping to check out the same high-grade content from you in the future as well. In truth, your creative writing abilities has encouraged me to get my own blog now ;)

RSS feed for comments on this post · TrackBack URI

Leave a Comment