Humans Eat More Than 100 Plastic Fibers With Each Meal
But when researchers at Heriot-Watt University set out to investigate that concern, they found that plastics in our own homes pose a much greater threat to humans.
The results of the study, published March 29 in Environmental Pollution, found that humans likely consume about 114 plastic microfibers each meal simply from household dust that settles on their plates.
Researchers gathered mussels from around the coast of Scotland in order to assess how many microplastics humans might ingest by eating the mussels.
As a control, they also set Petri dishes filled with sticky dust traps next to dinner plates at three separate homes.
Fourteen pieces of plastic settled on the dishes after 20 minutes, about the length of a meal. Given the difference in size, scientists calculated 114 such pieces would settle on a plate during the same time.
That adds up to 13,731 to 68,415 pieces per year.
In comparison, researchers calculated that eating mussels would only lead humans to ingest 100 microplastics yearly. Each mussel they studied contained about two plastic particles.
“These results may be surprising to some people who may expect the plastic fibres in seafood to be higher than those in household dust,” senior study author Dr. Ted Henry said in a Heriot-Watt University press release.
The study’s authors did not think that the plastics came from the home-cooked meals used in the study or the kitchens where they were prepared.