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The Truth about Fish and Fish Oil

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The Truth about Fish and Fish Oil

More recently, Fox news exploited an apparent correlation between increased levels of plasma omega-3 fatty acid and an amplified risk of prostate cancer. Then why is there an ample amount of benefits proven time and time again from the use of this anti-inflammatory omega-3 fatty acid? It is important to understand the truth about fish and fish oil before removing it from your diet.

The standard American diet (SAD) provides a greater amount of inflammatory fatty acids omega-6 than anti-inflammatory omega-3 fatty acids. So great in fact, SAD produces an imbalanced ratio of 15:1-17:1, omega-6 to omega-3.1 Although our body needs some omega-6 fatty acid, too much of it causes inflammation which makes us sick! We can avoid that by consuming a balanced quantity of the two. Read on to understand why eliminating omega-3 fatty acids may not be in your best interest!

Omega-3 fatty acids are considered essential because our body cannot produce them on its own, so we must consume them through our daily diet. Omega-3’s are known to support proper brain function, growth and development.2 In addition, these fatty acids will help keep inflammation to a minimum as well as help reduce one’s risk in diagnosis of chronic illness’ such as heart disease, cancer and arthritis.2 But perhaps the most important reason so many people stress the consumption of omega-3’s into our diet is its ability to lower high blood pressure, known as “The Silent Killer.” Clinical studies2 find that when taking 3 grams of fish oil supplement regularly, patients with untreated hypertension’s blood pressure may decrease.

After watching the Fox news report, Dr. Robert Rountree3 (chief medical officer at Thorne Research, Inc) reputed that this study should not cause caution because numerous studies support the benefits of omega-3’s!

Rountree noted that studying several blood tests analyzing omega-3 levels would have been appropriate; instead only a single blood test was conducted without any analysis of what the subjects had been consuming. Finally, there are many risk factors the subjects were partaking in that the researchers may have not taken into consideration before accusing the omega-3’s. These included:

  • 80% of the cancer subjects being overweight or obese
  • 30% had a first-degree relative diagnosed with prostate cancer
  • 64% were regularly consuming alcohol
  • 53% were smokers

We live in a pro-inflammatory environment causing diseases; and omega-3’s are a necessary defense. Therefore, not only should we still consume omega-3’s, but also cut down on our omega-6 fatty acid intake. Help yourself by contacting your physician if you are at risk of developing prostate cancer.

Here’s a link to the fox news report:



  1. National Institute of Health. The importance of the ratio of omega-6/omega-3 essential fatty acids. Available at: https://www.ncbi.nlm.nih.gov/pubmed/12442909.  Accessed July 17, 2013.
  2. University of Maryland Medical Center. Omega-3 fatty acids. Available at: https://umm.edu/health/medical/altmed/supplement/omega3-fatty-acids. Accessed July 16, 2013.
  3. Robert Roundtree, MD Chief Medical Officer, Thorne Research, Inc. Does fish oil really increase prostate cancer? See below:

Email form Dr. Roudtree,

As you may be aware, an article published in the July 2013 issue of the Journal of the National Cancer Institute suggests there is an association between elevated plasma omega-3 fatty acid levels and a heightened risk of prostate cancer.

This study must be interpreted with a significant degree of caution for a variety of reasons:

  • The data came from what is referred to as a retrospective, nested, case-control study. The data was extracted from another, much larger, previously conducted trial that was not originally intended to examine the relationship between omega-3 fatty acid levels and prostate cancer.  In other words, the original study was not designed to determine any of the conclusions reached in the analysis contained in the article.
  • The study’s results conflict with the results from other studies that do suggest that omega-3 fatty acids offer a protective benefit against prostate cancer; and these other studies were, in fact, designed to analyze that very outcome. (See link) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3629172/
  • Identifying one particular physiologic marker in a group of individuals with a given condition – in this case, an elevated omega-3 level in men with prostate cancer – does not prove causation, especially when that marker can be influenced by diet or behavior and is only measured at a single point in time.
  • It is also hugely important to realize that the authors of this study did not assess any of the participants’ dietary intake of fatty fish or omega-3 nutritional supplements – the study’s conclusions are based wholly on the results of a single blood test.
  • The omega-3 index, which measures both EPA and DHA within red blood cells, is a much more accurate indicator of long-term omega-3 intake and tissue status than is the plasma omega-3 level, which is subject to significant day-to-day variability.
  • A number of confounding risk factors might have influenced the purported outcomes in the study, despite attempts by the investigators to account for them:
    1. 53 percent of the subjects with prostate cancer were smokers.
    2. 64 percent of the cancer subjects regularly consumed alcohol.
    3. 30 percent of the cancer subjects had at least one first-degree relative with prostate cancer.
    4. 80 percent of the cancer subjects were overweight or obese.
  • Considering the extensive body of literature that supports the anti-inflammatory effects of omega-3 fatty acids, there is no credible biological mechanism, nor is one suggested in the article, that would explain why these essential fatty acids might increase tumorigenesis.

Summary:  Given the inconsistent data attributable to omega-3 fatty acids and prostate cancer, and acknowledging the broad range of health benefits that are almost universally accorded to omega-3 fatty acid consumption, it would be premature to stop eating fish or to discontinue taking omega-3 nutritional supplements on the basis of this study. 

In Health,

Robert Rountree, MD
Chief Medical Officer
Thorne Research, Inc.


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Dr. Jack Kunkel offers alternative medical services that provides custom and effective solutions for your body and mind by using a three-step strategic approach based on key pillars such as nutrition, exercise, and herbs & whole food supplements.