High levels of heart-healthy omega-3 fatty acids in the blood may be associated with an increased risk for developing aggressive prostate cancer, while elevated levels of unhealthy trans-fatty acids may lower the risk, a new study suggests.
Researchers examined data from a U.S.-wide study of more than 3,400 men, and found that those with the highest blood percentages of docosahexaenoic acid (DHA) were two-and-a-half times more likely to develop aggressive prostate cancer than those with the lowest DHA levels.
DHA is an inflammation-reducing omega-3 fatty acid commonly found in fatty fish. In the study, the men consumed the DHA primarily from fish rather than fish oil supplements.
The study also found that the risk of aggresive prostate cancer was 50 percent lower in men with the highest blood levels of trans-fatty acids, which are abundant in processed foods and associated with inflammation and heart disease.

Wait, how do they know the men consumed the DHA from fish? And if they know that, wouldn’t it imply that the fish consumption could be the source of the problem and not necessarily the DHA? Correlation, causation, etc.
Love the title, though.