(WSB)--Eating a serving of  fish each week could dramatically reduce your chance of advanced prostate cancer.

Omega-3 fatty acids appear to protect against advanced prostate cancer according to a new report in Clinical Cancer Research, a journal of the American Association for Cancer Research.

The study performed a case control analysis of 466 men diagnosed with aggressive prostate cancer and 378 healthy men.  Researchers looked at their diets  and found the men who ate more fish were cancer free. The men who didn't eat any ot little fish had prostate cancer.

John Witte,Ph.D., professor of epidemiology and biostatistics at the University of California San Francisco says men who eat just a serving of fish a day could cut the risk of advanced prostate cancer by 50 percent.

Dr. Witte says the best fish to eat appears to be salmon, mackerel and blue fish.