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Is Your Pregnancy Diet Safe? The Latest Research on Fish and Mercury

June 28, 2024
in Science
Is Your Pregnancy Diet Safe? The Latest Research on Fish and Mercury
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A recent study has developed a new model to better understand the complex relationship between fish consumption during pregnancy and child neurodevelopment. This model, derived from the New Bedford Cohort, considers both mercury levels and nutritional benefits of fish, providing clearer guidance for pregnant women.

Researchers have introduced a novel approach to evaluate the neurodevelopmental effects of fish consumption during pregnancy, focusing on the balance between mercury exposure and nutritional value. This study highlights the potential benefits of consuming low-mercury fish and the risks associated with high-mercury varieties.

Nutritional Benefits and Risks of Fish Consumption During Pregnancy

It may seem simple, but fish consumption during pregnancy is a complex scientific topic. On one hand, fish are rich in nutrients essential to brain development, including polyunsaturated fatty acids, vitamin D, selenium, and iodine. On the other hand, fish contain methyl mercury, a known neurotoxicant. This has led the US Food and Drug Administration (FDA) to recommend that expectant mothers limit consumption, which inadvertently causes many women to completely avoid fish consumption during pregnancy.

Advancing Research on Mercury Exposure and Fish Intake

Fish consumption is an important route of methyl mercury exposure, however, efforts to understand the health risk posed by mercury are further complicated by the fact that the nutritional benefits from fish may modify or reduce the toxicity posed by mercury. A new study appearing in the American Journal of Epidemiology based on data from a cohort of residents of a coastal community in Massachusetts creates a new framework that could untangle these questions, reduce confusion, and produce clearer guidance on fish consumption for pregnant mothers.

A New Model to Assess Fish Consumption and Neurodevelopment

“We propose an alternative modeling approach to address limitations of previous models and to contribute thereby to improved evidence-based advice on the risks and benefits of fish consumption,” said the authors, who include Sally Thurston, PhD, with the University of Rochester Medical Center, Susan Korrick, MD, MPH, with Harvard T.H. Chan School of Public Health and Brigham and Women’s Hospital, and David Ruppert, PhD, with Cornell University. “In fish-eating populations, this can be addressed by separating mercury exposure into fish intake and average mercury content of the consumed fish.”

The new research comes from an analysis of data from the New Bedford Cohort, which was created to assess the health of children born to mothers residing near the New Bedford Harbor Superfund site in Massachusetts. The current study included 361 children from the cohort who were born between 1993 and 1998 and underwent neurodevelopment assessments, including tests for IQ, language, memory, and attention, at age eight years.

The researchers were able to measure mercury exposure during the third trimester of pregnancy through hair sample collected from the mothers after birth. While hair samples have been the traditional method to study maternal mercury exposure, this approach alone cannot distinguish between mothers who frequently consumed low-mercury fish compared to those who consumed a smaller quantity of high-mercury fish.

Implications and Future Directions in Fish Consumption Research

To overcome this limitation, the researchers instead created a model that includes estimates of mercury exposure per serving of fish. This was possible because mothers in the cohort also completed a food questionnaire and reported the type and frequency of fish and shellfish consumed during pregnancy. The authors estimated the average mercury levels by type of fish, and when combined with the information about the mother’s diet, they were able to create a more precise and detailed method to estimate the joint associations of pregnancy fish intake and fish mercury levels on neurodevelopment.

Using this model, the researchers found that the relation between pregnancy fish consumption and subsequent neurodevelopment varied depending on the estimated average mercury levels in the fish. Specifically, consuming low mercury-containing fish was beneficial, while consuming fish with higher levels of mercury was detrimental.

“Given methodologic limitations to previous analyses, future work expanding our alternative modeling approach to account for both the average mercury and nutritional content of fish could facilitate better estimation of the risk-benefit tradeoffs of fish consumption, a key component of many healthy diets,” said the authors.

The authors are in the process of applying this model to other large studies of maternal fish consumption, including the Seychelles Child Development Study, in which Thurston serves on as an investigator.

Reference: “A Novel Approach to Assessing the Joint Effects of Mercury and Fish Consumption on Neurodevelopment in the New Bedford Cohort” 28 June 2024, American Journal of Epidemiology.
DOI: 10.1093/aje/kwae149

The American Journal of Epidemiology study was supported with funding from the National Institute of Environmental Health Sciences.

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/is-your-pregnancy-diet-safe-the-latest-research-on-fish-and-mercury/

Tags: latestpregnancyscience
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