Here is a recent meta-analysis by a group of British researchers which has just been published in the British Journal of Medicine. Their conculsion? Long chain and shorter chain omega 3 fats do not have a clear effect on total mortality, combined cardiovascular events, or cancer.
I see a couple of methodological flaws with this study, which can be found here:
http://bmj.bmjjournals.com/cgi/rapidpdf/...ourcetype=HWCIT
But I thought i would open the topic to discussion first.