PCBs still affecting our health decades later
Chemical banned by the US 3 decades ago hurts seniors' cognitive performance
The use and production of PCBs have been phased out for over 40 years, but these highly persistent substances are still found in the blood of most individuals, especially older people. 708 Americans participated in Bouchard's study, which involved providing blood samples to determine the levels of toxins in their bodies and completing a memory and motor-skill task to determine their cognitive performance. The PCB levels found in their bodies were representative of those in the general U.S population. "Aging persons could be at particular risk because of higher cumulative exposure built up across a lifetime, susceptibility due to underlying medical conditions, such as vascular disorders, and diminished cognitive reserve capacity," Bouchard said. "Our present findings suggest that PCBs, even at levels generally considered to pose low or no risk, may contribute to cognitive deficits."
PCB disposal processes currently range from effective remediation to deliberate dumping. They accumulate in the lipid tissues of animal and marine life forms, and biomagnify across the food chain. As a result, PCBs are today ubiquitously present in tissues of human populations, in North American and around the world. This study underscores the importance of improving our response to PCBs as a health hazard.
Original publication
"Polychlorinated Biphenyl Exposures and Cognition in Older U.S. Adults", Environmental Health Perspectives, November 25, 2013
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