A study was carried out by researchers from Zhejiang University and the APCNS Center of Nutrition and Food Safety in China. It was published in the peer-reviewed British Medical Journal. Researchers were particularly interested in assessing the effects of a type of fatty acid called omega-3 These fatty acids are found in oily fish such as salmon and tuna, and some plant sources.
The analysis included more than 800,000 women. Just over 20,000 of these women developed breast cancer during follow-up. Women with the highest intake of n-3 PUFAs from fish (marine) sources were found to have a 14% reduction in risk of breast cancer compared with women with the lowest intake.
Because women who ate fish may have done other things that affected their health this study is not considered to be proof positive that omega 3 reduced the cancer. But when you consider that omega 3 reduces the estrogen in the womans system it is likely that the fish accounted for the results.
They believe that a healthy diet should include at least two portions of fish a week, including one of oily fish (such as salmon or mackerel). However, babies, children and women who are pregnant, breastfeeding or planning to have children should have no more than two portions of oily fish a week.The rest of us can eat up to four portions a week. This is the advised maximum level to avoid overexposure to marine pollutants.
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