Food packaging linked with higher exposures to PFAS
Preparing meals at home can reduce exposure to harmful per- and polyfluoroalkyl substances (PFAS) that are commonly found in take-out and fast food packing, according to a new study by researchers at Silent Spring Institute in Newton, Massachusetts and published in the journal Environmental Health Perspectives.
Researchers analyzed data from 10,106 participants in the National Health and Nutrition Examination Survey (NHANES), a program of the Centers for Disease Control and Prevention (CDC) that tracks health and nutritional trends in the United States. The participants had answered detailed questions about their diet, recalling what they ate over four different time scales: in the previous 24 hours, seven days, 30 days, and 12 months. The participants provided blood samples that had been analyzed for several different PFAS chemicals.
The researchers found that people who ate more meals at home had significantly lower levels of PFAS in their bodies. The vast majority, 90 percent, of these meals consisted of food purchased at a grocery store. In contrast, people who consumed more fast food or ate more frequently at restaurants, including pizza places, tended to have higher levels of PFAS in their bodies. This suggests that fast food and food from other restaurants is more likely to be contaminated with PFAS, which may be due to greater contact with PFAS-containing food packaging, the researchers said in a statement.
PFAS are a class of chemicals widely used in an array of nonstick, stain-resistant, and waterproof products, including carpeting, cookware, outdoor apparel, and food packaging. Food crops and livestock can also contain PFAS through exposure to contaminated soil and water. PFAS have been linked with numerous health effects including cancer, thyroid disease, immune suppression, low birth weight, and decreased fertility. Because the chemicals are ubiquitous and exposures are widespread in the population, scientists are concerned about the health risks.
A limitation of the study is that the data were collected between 2003 and 2014 and only included results for long-chain PFAS because they were the most frequently detected. In recent years, due to health concerns, U.S. manufacturers have been replacing long-chain PFAS with newer varieties. These replacement PFAS are also extremely persistent and new research suggests they raise similar health concerns. For this reason, many experts are calling for restrictions on the entire class of chemicals.
In addition to PFAS, food packaging can contain other chemicals of concern, including hormone-disrupting compounds such as BPA and phthalates, said co-author Kathryn Rodgers, MPH, a staff scientist at Silent Spring and co-author of the study.
"The general conclusion here is the less contact your food has with food packaging, the lower your exposures to PFAS and other harmful chemicals," said Rodgers. "These latest findings will hopefully help consumers avoid these exposures and spur manufacturers to develop safer food packaging materials."