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Fish consumption advisories fail to cover all types of contaminants
Date:4/17/2014

A new modeling study suggests that fish consumption advisories for expecting mothers are ineffective in reducing infant exposure to long-lived contaminants like persistent organic pollutants (POPs).

The study, performed by a team of researchers including University of Toronto Scarborough PhD student Matt Binnington and Professor Frank Wania, looks at how different levels of environmental contamination, a mother's compliance with advisories, and the behavior of chemicals in the body influenced exposure in her children.

Their model estimates that women who stop eating fish shortly before or during their pregnancy may only lower their child's exposure to POPs by 10 to 15 per cent.

"We have to be careful in saying fish advisories don't work at all because they can work very well for reducing exposure to quickly eliminated contaminants, such as mercury," says Binnington. "But for POPs we found that they are not very effective."

POPs are compounds that take a long time to break down and as a result can persist in the environment and begin to accumulate in humans by way of the food chain. While many POPs such as DDT and PCBs have long been banned from production, they still exist in the environment. Fish advisories have been developed for these chemicals because they are easily passed from mothers to their children during pregnancy and nursing, potentially impacting healthy infant neurodevelopment.

Binnington says consumption advisories for many POPs are ineffective because they can remain in the body for years or even decades due to properties that make it difficult for the human body to eliminate them. The same is not true for mercury-based advisories, as the time it remains in the body is much shorter compared to POPs.

"Something like mercury stays in the body for only a few months and by temporarily adjusting your diet you can reduce exposure," says Binnington.

The limitation with consumption a
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Contact: Don Campbell
dcampbell@utsc.utoronto.ca
416-208-2938
University of Toronto
Source:Eurekalert  

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