Chewing Gum Could Release Microplastics Into Saliva, Study Finds

According to a new study currently undergoing peer review, chewing gum could be a source of ingested microplastics. Researchers found that chewing gum could release thousands of microplastic particles into saliva over time, increasing the chance of ingestion.

“Our goal is not to alarm anybody,” Sanjay Mohanty, principal investigator of the study and an engineering professor at the University of California, Los Angeles (UCLA), said in a statement. “Scientists don’t know if microplastics are unsafe to us or not. There are no human trials. But we know we are exposed to plastics in everyday life, and that’s what we wanted to examine here.”

Scientists analyzed five brands of natural and five brands of synthetic chewing gums to determine potential for microplastic shedding. While synthetic chewing gums are made with rubbery, petroleum-based polymers, natural gum varieties rely on plant-based polymers for that chewable texture, with the polymers often coming from tree sap.

“Our initial hypothesis was that the synthetic gums would have a lot more microplastics because the base is a type of plastic,” said Lisa Lowe, a graduate student at UCLA who is presenting the research this week at the American Chemical Society spring meeting.