Good resources, Mandy. I had wondered if other aspects of diet were controlled in the study, and it appears they weren’t. So participants could have been living off 5 meals a day of omega-6 heavy fried food. They could also have been eating completely paleo. The point is that human physiology can’t be measured and quantified in a vaccuum. All the systems are interrelated. Let’s compare rates of prostate cancer among those who consume little grains and sugar, get plenty of fat and protein, and supplement with fish oil compared to those who eat the average American diet, and then see what happens.

http://www.marksdailyapple.com/fish-oil-prostate-cancer/

Mark isn’t perfect, but he does his research and usually writes very balanced, informative articles. I agree that more studies need to be performed (preferably in vivo) in order to be more conclusive. What worries me is that other media sources will likely report the findings and not any of the details, or worse, try to push their own agenda with it without even providing a link to the study itself (see http://www.vegsource.com/news/2011/04/study-fish-oil-increases-aggressive-prostate-cancer.html).

Below is a link to the study, which unfortunately requires either a subscription to the American Journal of Epidemiology or $40 to have access to the article for a day (though students may be able to get around this).

http://aje.oxfordjournals.org/content/early/2011/04/19/aje.kwr027.abstract

http://blogs.menshealth.com/health-headlines/the-dark-side-of-omega-3s/2011/05/05?cm_mmc=DailyDoseNL-_-05102011-_-HTML-_-body

This is by no means conclusive of course, and I still love the stuff.