Fish Oil: Too Much of a Good Thing?
Fish oil may have some benefit for the heart. But a study in the Journal of the National Cancer Institute links higher blood levels of the omega-3 fatty acids in fish oil to a higher risk of prostate cancer. Study author Alan Kristal says the potential mechanism is unclear, but he warns that supplements can sometimes increase the risk of the very diseases they’re meant to prevent.
Alan Kristal is associate head of the Cancer Prevention Program at the Fred Hutchinson Cancer Research Center and an epidemiology professor at the University of Washington in Seattle, Washington.