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Environmental Factor

Environmental Factor

Your Online Source for NIEHS News

July 2020

National Academies asks experts to explore aging, environment interplay

As one ages, the body responds differently to chemicals in the environment; in turn, exposures — even in early life — affect aging processes.

Exposures a person receives at any age affect how they age, and aging influences the body’s response to substances in the environment. Both aging and disease processes affect the body at multiple levels, from cellular — think chronic inflammation — on up to the whole organism, as when a person becomes disabled.

These interrelationships — and the research needed to clarify them — were the top concerns of experts at a June 9-10 virtual workshop sponsored by the National Academies of Science, Engineering, and Mathematics (NASEM).

human aging concept shown with 3 trees Speakers addressed aging as ultimately affected by processes and exposures across a person’s whole life.

Bridge aging, nutrition, environment

Throughout life, aging and health are influenced by genetic makeup, nutrition, and substances or conditions in the environment, according to organizing committee member and NIEHS grantee Gary Miller Ph.D., from Columbia University. “Bridging these disciplines is a logical next step,” he said.

One such bridge involves integrating biomarkers of aging with those that reflect relevant exposures, such as air pollution, heavy metals, arsenic, and consumer products. “We need better data to understand how these chemicals intersect,” Miller said.

Several discussions during the two-day event grappled with evaluating exposures to chemical mixtures and interdependent effects of their components.

Timing matters

Michelle Heacock, Ph.D. Heacock works in the Superfund Research Program, which studies health effects of and clean up technologies for chemicals and other substances found at Superfund sites across the country. (Photo courtesy of Steve McCaw)

“Evidence is increasing that early life exposures can impact the risk of disease … long after an exposure has occurred,” said NIEHS Health Scientist Administrator Michelle Heacock, Ph.D., in her opening remarks. Heacock introduced the idea of individual susceptibility, or that people may respond differently to the same exposure.

“Differential responses can be a function of duration of the exposure, individual genetics, underlying health status, sex differences, and timing of exposures,” she noted. “We need to consider that exposure burdens can combine with other social determinants of health, such as age, gender, education, race, and income, which can also affect the given individual’s response.”

Luigi Ferrucci, M.D., Ph.D., scientific director of the National Institute on Aging, agreed. Timing of exposure, especially during sensitive periods of development, is an important consideration.

“When you expose children, you get deficits that last a lifetime,” said Suzanne Fitzpatrick, Ph.D., senior advisor for toxicology at the Food and Drug Administration Center for Food Safety and Applied Nutrition.

In another take on time, Ferrucci described three lenses on aging — biology, clinical symptoms, and life functions. He showed how biological changes occur long before function is impaired or clinical symptoms appear. The primary tool we use to measure aging fails to capture this complexity. “We use a watch,” he said. “[Yet] chronological age may have nothing to do with health and its trajectory.”

Vulnerable populations

The May 25 death of George Floyd at the hands of Minneapolis police officers, as well as the deaths of Ahmaud Arbery, Breonna Taylor, and others, was on the minds of participants throughout the workshop, underscoring racial and ethnic health disparities.

Uchechi Mitchell, Ph.D., from the University of Illinois at Chicago, described how racial and ethnic disparities in cardiometabolic risk increase with age. “Racism is the primary toxin underlying disparities in cardiometabolic risk and other health outcomes,” she said.

“Older persons of color may be particularly impacted because they are more likely to live in socially and economically disadvantaged neighborhoods, and they are less likely to move to neighborhoods of higher socioeconomic status,” Mitchell said. “Addressing disparities requires an ecological approach.”

Participants asked how to translate science into immediate action beneficial to vulnerable populations. Community-engaged research is a powerful approach, according to Sandra Howard, from the Department of Health and Human Services Office of the Assistant Secretary for Health. NIEHS has long supported this research approach, funding projects such as Environmental Health for Alabama Communities.

Howard encourages researchers to involve communities from the beginning. “Communication is important to establish at the beginning, [as you develop] ideas about what it is you want to do,” she explained. Howard suggested scientists become familiar with leadership, important issues, and other factors and be clear about procedures and protection of confidentiality and health.

Videos of each session, as well as agenda and other materials are available on the workshop webpage, linked above.

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