WASHINGTON (AP) — The Food and Drug Administration is updating its advice for pregnant women on the appropriate levels of mercury in seafood. Commissioner Margaret Hamburg says the agency won't require mercury labels on seafood packages. 

In a wide-ranging interview Friday with The Associated Press, Hamburg said the agency will update guidance on mercury in different varieties of seafood and what that means, a long-awaited move aimed at helping women better understand what to eat when they're pregnant.

"It's an advisory, not an effort to mandate labeling," Hamburg said. "Different seafood products do contain different levels of mercury, and so different seafood products can be rated in terms of levels of mercury."

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