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In "The Fish on My Plate," author and fisherman Paul Greenberg sets out to answer the question "what fish should I eat that's good for me and good for the planet?" As part of his quest to investigate the health of the ocean — and his own — Greenberg spent a year eating seafood at breakfast, lunch and dinner. Courtesy of FRONTLINE hide caption

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Courtesy of FRONTLINE

Eat fish or take a fish oil supplement? Research suggests eating fish regularly over a lifetime is good for the brain. But when it comes to staving off cognitive decline in seniors, fish oil supplements just don't cut it, a study finds. iStockphoto hide caption

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iStockphoto

If Fish Is Brain Food, Can Fish Oil Pills Boost Brains, Too?

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In a study of 4,000 pregnant women, fish accounted for only 7 percent of blood mercury levels. JackF/iStockphoto.com hide caption

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JackF/iStockphoto.com

If you eat fish, rather than take a fish-oil supplement, is there more likely to be a benefit? There's more than a suggestion that this is indeed the case. Verena J Matthew/iStockphoto hide caption

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Verena J Matthew/iStockphoto