New Study Challenges FDA Draft Assessment of Mercury in Fish

A new study from the Connecticut Department of Health has challenged a recent Food and Drug Administration (FDA) draft assessment weighing the benefits of fish consumption against the risks associated with mercury exposure. Gary L. Ginsberg and Brian F. Toal, “Quantitative Approach for Incorporating Methylmercury Risks and Omega-3 Fatty Acid Benefits in Developing Species-Specific Fish Consumption Advice,” Environmental Health Perspectives, February 2009. FDA had concluded that consumers may derive greater benefits from the lean protein, omega-3 oils and minerals in fish if they exceed the current safety threshold set at 12 ounces of fish per week. But the Environmental Protection Agency (EPA) and other groups have since criticized this assessment for “serious scientific flaws,” urging consumers to abide by the safety standards currently recommended by both agencies.

Meanwhile, the Connecticut Department of Health study has expanded on the FDA study by identifying some fish species, such as swordfish and shark, that contain higher methylmercury levels and are not safe for daily consumption. Noting that several other species–like farmed salmon, herring and trout–are low in methylmercury, the researchers also warned that even “safe” fish could contain other contaminants, including polychlorinated biphenyls, which may offset any significant health benefits. See Inside EPA, February 27, 2009