Microplastics — tiny plastic particles smaller than a human hair — have become ubiquitous in water, food, soil, and even human organs, with studies detecting them in the blood of nearly 80% of people.
Linked to health issues including heart disease, infertility, and cancers, these pollutants are now a growing global concern. But experts say exposure can be reduced by doing one simple thing: stop heating plastics.
“The kitchen is ground zero for microplastic exposure,” said Ravyn Williams, a physician assistant in Los Angeles. “Never reheat food or drinks in plastic, even if it’s labeled BPA-free.” Instead, she recommends using glass, ceramic, or stainless steel containers.
Polymer researcher Max Pennington explained that heat softens plastics and accelerates the release of microplastic particles into food, drink, or water.
Recent UK research found microplastics in every beverage tested, from coffee and tea to bottled and tap water. Hot drinks had significantly higher levels — a liter of hot tea contained twice as many plastic particles as iced tea. Even paper cups, lined with plastic, shed particles when exposed to heat.
Experts also warn that hot laundry cycles release millions more microplastic fibers from synthetic fabrics like polyester compared to cold washes.
Emerging research suggests microplastics can accumulate in blood vessels and organs, increasing inflammation and raising the risk of heart attack, stroke, and certain cancers. A 2024 study found plastic particles embedded in patients’ arteries, while other studies have linked exposure to reduced sperm counts and chronic diseases such as hypertension and diabetes.
To limit risk, researchers recommend washing clothes in cold water, avoiding single-use plastics, and never heating food or drinks in plastic containers.
