Disposable cups used for instant noodles may be exposing consumers to a significant number of microplastic particles, according to a new study. Researchers found an average of 318 microplastic particles per cup after simulating the preparation of instant noodles with hot water.
Those who frequently consume instant noodles prepared in these cups could potentially ingest over 1,000 microplastic particles each week, the study suggests. This finding adds to existing concerns about microplastics entering the body through food and drink, particularly when heated.
Microplastics in Food Containers
The study focused on twenty different samples of bucket-style instant noodles from China, Japan, South Korea, and Thailand. Researchers filled the empty, cleaned containers with hot water (95 degrees Celsius or 203 degrees Fahrenheit) to mimic the process of making the noodles. After allowing the water to sit, they shook and stirred it to simulate consumption.
Testing of the water revealed an average of 318 microplastic particles per bucket. The microplastics varied in shape, size, and color, but were predominantly composed of polyethylene (PE) and composites of polyethylene and polypropylene (PP+PE). Polyethylene is a common plastic used in single-use items and has been linked to potential health effects such as cellular stress, inflammation, and cell death when it breaks down into microplastics and enters the bloodstream, lungs, placenta, and brain.
The study authors stated that these plastics are likely linked to the plastic lining within the disposable noodle containers, where molten polyethylene film is laminated onto paper substrates. The research noted that a similar issue occurs with disposable coffee cups, with approximately 50,000 microplastic particles detected in every three to four such cups.
Broader Context of Microplastic Consumption
While instant noodles are a popular convenience food, particularly in Asia where the majority of sales occur, the United States also has a high consumption rate. Previous research has indicated that humans may consume about a credit card's worth of plastic each week through various pathways. Microplastics have been found to potentially impact various bodily systems, including the heart, blood vessels, bones, and immune system, and may also affect hormone levels.
The study's methodology involved letting the hot water sit in the containers for a total of 35 minutes, a duration longer than the typical preparation time suggested on most instant noodle packaging, which usually calls for three to five minutes. The vigorous shaking and stirring with a glass rod were also employed to dislodge particles, though the extent to which these actions accurately replicate real-world mixing and eating is unclear. The authors also acknowledged the possibility of lab contamination contributing to the particle count.
Some experts have raised concerns about the potential for overblown claims in microplastic research, highlighting the need for more robust evidence to support extraordinary findings. The study's findings contribute to an ongoing scientific effort to understand the full extent of microplastic exposure and its health implications.