With all the distressing news about microplastics in your food, you might be tempted to comfort yourself with a nice cup of tea. Not so fast. A new study reveals tea brewed in “silken” tea bags could contain billions of plastic particles in a single cup, the Canadian Broadcasting Corporation reports. Researchers steeped the plastic tea bags in hot water, and found the number of particles released into a cup was orders of magnitude greater than those in other food and drinks, they report this week in Environmental Science & Technology. The scientists aren’t sure whether these particles pose a risk to tea drinkers, because few studies examine microplastics’ effects on human health. When they exposed water fleas to the microplastics, though, they say the tiny creatures swam “crazily.” Apparently, the particles weren’t their cup of tea.