There is considerable evidence from epidemiological, clinical and biochemical studies that n 3 PUFA, mainly eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids, exert a strong positive influence on human health affecting neural development, ability of seeing and learning, and, by modulation of eicosanoid synthesis, decreasing the cholesterol levels, the risk of cardiovascular diseases, certain cancers such as breast, colon and perhaps, prostate