SOURCES: American Heart Association. CDC. Environmental Protection Agency. Thomas Burke, PhD, National Academy of Science's committee on the health effects of methylmercury. FDA. WebMD Medical News: "Mercury in Fish May Not Be Toxic." Gail Frank, RD, spokeswoman, ADA; professor of nutrition, California State University, Long Beach. Environmental Working Group report: "PCBs in Farmed Salmon: Factory Methods, Unnatural Results." K. Dun Gifford, president and founder, Oldways Preservation Trust.

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