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　　This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.
It's been touted¹ for its healthful, anti-inflammatory properties. It's been recommended for helping² ease the pain of arthritis³, preventing cancer and slowing memory loss. But some recent studies of fish oil show that it may not always act as advertised—and that you can sometimes have too much of a good thing.
First, the latest news. Researchers spent 18 months following almost 300 patients with mild to moderate Alzheimer's. Some took fish oil, others a placebo⁴. And there was no difference cognitively⁵ between the two groups. The study is in the current Journal of the American Medical Association.
It's a mixed bag on cancer. A study of more than 35,000 post-menopausal women found that those who took fish oil seemed half as likely to develop breast cancer as those who didn't. That work was in the July issue of Cancer Epidemiology, Biomarkers & Prevention.
But a study in the October 15th issue of Cancer Research found that mice with inflamed⁶ bowels⁷ developed colitis and aggressive colon⁸ cancer when they were given high doses of fish oil.
So, fish oil might in fact have a healthful role in some circumstances. But you don't want to swallow every fish story.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.