Recent studies claiming to detect microplastics in human organs, even the brain, have sparked both concern and scientific debate. as research into the potential health effects of these microscopic particles intensifies, a global team of 30 scientists has proposed a new, standardized framework for assessing microplastic presence and ensuring more reliable results. Published this week in Surroundings & Health, the framework aims to address growing questions about study methodology and potential contamination issues that have plagued the field. This comes amid growing recognition that human exposure to microplastics – through food, air and water – is likely widespread.
How Much Plastic is in Our Bodies? As studies raise concerns about the potential health effects of microplastics, researchers worldwide are working to establish a standardized framework for evaluating the risks.
Recent studies have gained attention for claiming to have found microplastics throughout the human body, including in organs like the brain and in the bloodstream. Understanding the extent of microplastic exposure is a growing area of public health concern.
However, some of these studies, particularly one suggesting the presence of the equivalent of a teaspoon of plastic in the brain, have faced significant criticism.
Some scientists argue that these studies may be flawed due to widespread plastic contamination in laboratory settings, and that the techniques used could misidentify human tissues, such as brain fat, as plastic.
To address these concerns, 30 scientists from 20 research institutions globally have proposed a new framework for microplastic research, published Tuesday in the journal Environment & Health.
This method aims to help researchers more accurately assess the level of certainty regarding the amount of microplastics detected.
The widespread presence of microplastics in the environment is not disputed, and experts believe it is “very probable” that we regularly ingest microplastics through the air and food, according to Leon Barron, a researcher at Imperial College London.
However, according to the lead author of the framework presented Tuesday, there is currently insufficient evidence to definitively state that these microplastics are harmful to human health.
Detecting microplastics – and even smaller nanoplastics – is challenging, and some research has reported finding them in areas of the human body where their presence would be “the least plausible,” noted Barron.
– “Crime Scene” Analysis –
For example, a study published in Nature Medicine in early 2025 claimed to have detected relatively large plastic particles in the brains of recently deceased individuals. This would require those particles to have crossed the blood-brain barrier, a powerful defense mechanism that isolates the brain, a point of contention for skeptical scientists.
Some experts have also raised concerns that the technique used in that study – pyrolysis-GC-MS – can confuse fats with polyethylene, a common plastic used in packaging.
In February 2025, CNN reported that the amount of plastic found in the study represented a total volume equivalent to about a teaspoon.
However, Matthew Campen, a professor at the University of New Mexico and the lead author of that study, clarified to the AFP that “the teaspoon concept was a media invention.” “The issue was extrapolating from a single brain sample to the whole brain, which constituted a significant overestimation,” he said.
Other studies have been criticized for lacking quality control measures to rule out cross-contamination. Without these measures, “it’s impossible to know whether the plastics detected come from the tissues themselves or from containers, chemicals, lab equipment, or airborne plastic particles,” said Dušan Materić, a microplastics specialist.
The proposed framework encourages researchers to employ diverse techniques to reliably identify microplastics.
Barron likened the approach to the methods used by forensic scientists analyzing carpet fibers found at a crime scene.
The goal is to “put all laboratories conducting this work on a level playing field” by allowing them to specify their confidence level in their results, he said, adding that this idea “is already gaining traction.”
This includes researchers being transparent by publishing all raw data from their studies and adopting rigorous quality control practices.
“To be clear, microplastics are a problem,” Barron concluded. “All the research conducted so far has been done in good faith,” but determining whether microplastics are harmful to our health requires agreement on the levels found within the human body. He believes that “scientists denigrating each other in the media is not constructive.”
AFP
