• ANALYSIS OF PUBLISHED REPORT ALLEGING DHA-RICH FISH OIL PROMOTES AGGRESSIVE PROSTATE CANCER

    Posted July 12, 2013: by Bill Sardi

    1. A paper, written by investigators at the Fred Hutchinson Cancer Research Center in Seattle, as published in the Journal of the National Cancer Institute, is a follow-up from a prior study published in 2011 that reached a similar conclusion. So it’s not news. (See No. 4 below) It is a confirming study.  It appears to have been times for release to coincide with other negative reports involving dietary supplements.

    2. The paper did not factor for other dietary supplements; maybe the non-aggressive cancers were vitamin supplement users. It is well established that omega-3 oils can promote or inhibit cancer based upon a variety of factors not considered in this narrow data analysis. A list of the carcinogenic and anti-carcinogenic properties of omega-3 oils were published in the American Journal of Clinical Nutrition.

    3. For unexplained reasons, the news media makes no mention of a prior report (May 2013) written by some of the same authors at the Fred Hutchinson Cancer Research Center, which indicates DHA-rich fish oil was associated with more aggressive prostate tumors, but the effect was completely opposite among men with a particular genetic profile.  Recently it was found that a particular gene urine test was more predictive for prostate cancer than a PSA test in Japan.

    4. In a prior study authored by the same investigators (Am J Epidemiology 173: 1429-39, 2011), they reported the risk for aggressive prostate cancer rose, then fell, then rose (1.00, 2.65, 1.84, 2.50) with increasing blood concentration of DHA.  This is not a consistent response.

    5. The 2011 study also concluded that increasing blood concentrations of trans fat (hydrogenated fats), known to be deleterious in arteries, cut the risk for aggressive prostate cancer in half. So are we to conclude men should throw out DHA fish oil capsules (DHA being essential for life) and return to eating sticks of margarine?

    6. No mortality data is provided, so we really don’t know if males with prostate cancer would survive longer avoiding DHA or not.

    7. If consumers want omega-3 oil devoid of DHA, they can consume flaxseed oil which only converts to EPA (not DHA) and provides phytoestrogens (lignans) and has been shown to reduce growth of prostate tumors, as tested in humans.

    8. Japanese men, who consume the most omega-3 fish oil from dietary sources in the world, are recently reported to have a rising incidence in their risk for prostate cancer (probably due to better detection methods), but a declining risk for death from this very same disease.It is important to first evaluate anti-cancer measures by the recognized gold standard – survival (prostate cancer death).  It is important to evaluate a wider range of dietary habits associated with lower rates of prostate cancer death than just a singular measure like DHA-fish oil.

    © 2013 Bill Sardi, Knowledge of Health, Inc.

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