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Canned light tuna, long recommended as the safer choice because of its presumably lower mercury content, sometimes harbors at least as much of that potentially harmful heavy metal as white tuna does, our analysis of Food and Drug Administration data has shown. That finding raises new concerns about the safety of canned tuna for pregnant women.
We scrutinized the results of FDA tests posted recently on its Web site and, as expected, found that most cans of light tuna had only a third as much mercury, on average, as white tuna, also known as albacore. But 6 percent of the light-tuna samples contained at least as much of the metal--in some cases more than twice as ...