All types of proteins contained microplastics
In the February study, which was published in Environmental Research, researchers looked at over a dozen commonly consumed proteins, including beef, breaded and other types of shrimp, chicken breasts and nuggets, pork, seafood, tofu and several plant-based meat alternatives, such as nuggets, plant crumbles similar to ground beef and plant-based fish sticks.
Breaded shrimp contained the most tiny plastics by far, at well over an average of 300 microplastic pieces per serving. Plant-based nuggets came in second, at under 100 pieces per serving, followed by chicken nuggets, pollock fish sticks, minimally processed White Gulf shrimp, fresh caught Key West pink shrimp and a plant-based fish-like stick.
The least contaminated proteins were chicken breasts, followed by pork loin chops and tofu.
After comparing the results to consumer consumption data, researchers estimated the average exposure of American adults to microplastics could range between 11,000 and 29,000 particles a year, with a maximum estimated exposure of 3.8 million microplastics per year.