A carefully conducted study of fish and fish oil consumption in Iceland has found that eating salted or smoked fish increased the risk of prostate cancer, whereas taking fish oil supplements reduced the risk of the disease.
Johanna E. Torfadottir, PhD, of the University of Iceland, Reykjavik, and her colleagues studied 2,268 men, ages 67-96 years, of whom 410 had been diagnosed with prostate cancer. The researchers asked the subjects to complete a food-frequency questionnaire to assess their eating habits in early life, midlife, and later years.
The most common types of fish consumed were cod and haddock, which are low in the omega-3s EPA and DHA. However, many of the men also consumed fish oils, particularly cod liver oil, with a recommended daily intake of 400 mg.
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