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Canned Tuna: Avoid if Pregnant?

Consumer Reports: Some Canned Tuna May Have Higher Mercury Levels Than Once Thought

FDA Interpretation

David Acheson, MD, chief medical officer of FDA’s Center for Food Safety and Applied Nutrition, says the agency does not dispute the magazine’s calculations. Acheson says that “a single dose of mercury is not good.”

But he says that a years-long scientific review convinced the agency that there is little danger even if pregnant women eat canned light tuna with higher-than-average mercury contamination once in a while.

“We are not aware of any science that would indicate that having an occasional meal at that level would cause any harm, and if that science is out there, I would love to see it,” Acheson tells WebMD.

Consumer Reports urged women of childbearing age to limit tuna consumption to about three chunk-light cans per week or one can of white tuna (albacore) or solid-light tuna, since mercury can linger in the body even after you are no longer eating it.

Six-ounce servings of lower-mercury seafood -- including salmon, tilapia, shrimp, and clams -- appear safe for daily consumption by women, the magazine said; three-ounce servings for small children up to 45 pounds also appear safe.

Other Perspectives

Joshua T. Cohen, PhD, a lecturer at the Institute for Clinical Research at the Tufts New England Medical Center in Boston, says Consumer Reports was misinterpreting the significance of data showing that 6% of light-tuna cans exceed averages for higher-mercury white tuna.

“What your body sees is the average [mercury dose] over several weeks. The idea that the departure above the average on one day is going to mean a bad health outcome is like saying that two slices of apple pie at Thanksgiving is going to lead to obesity,” says Cohen, who authored a major study on the risks and benefits of fish consumption. The study was funded by food industry groups and the US Tuna Foundation, another industry group.

A statement by the foundation said tuna has proven health benefits and that Consumer Reports had done “a great disservice” by using “incomplete facts.”

Rangan says that more-than-usual caution is warranted for pregnant women.

“We’re talking about exercising caution for a particularly vulnerable population with fetuses with vulnerable nervous systems. The fact of the matter is that it’s a preventable risk, so why when there are so many options, wouldn’t you want to minimize your risk of exposure,” she says.

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