What human studies have found, why food film is only part of the picture, and why washing is useful but not a complete solution.
We pay attention to what we eat. But food, water and the air around us can also contain tiny plastic particles. Understandably, reports of plastic in human tissues raise questions: how did it arrive, what happens to it, and can we get it out?
There are practical ways to reduce avoidable exposure. However, the science does not yet provide a dependable “plastic detox,” or a precise estimate of everyone's risk.
What are microplastics and nanoplastics?
Microplastics are small plastic particles, generally described as less than 5 millimetres across. Nanoplastics are smaller still, commonly defined as below 1 micrometre—one thousandth of a millimetre. Definitions vary between studies. [1]
They include fragments, fibres and other shapes. Some are manufactured small; others result from wear and the breakdown of larger objects. Different plastics, sizes and shapes can behave differently, so “microplastics” is not one uniform substance.
How do they enter our bodies?
Food and drinking water
Plastic particles can reach food through polluted soil, water and airborne dust. Food processing and contact materials can also contribute. Drinking-water contamination may arise at several stages, including the source, treatment and bottling. [2, 3]
The air we breathe
Synthetic textiles and other materials can shed fibres into indoor dust. Outdoor sources include plastic litter and tyre wear. We may inhale particles, or swallow some after airway mucus transports them towards the throat. The relative contribution of air, food and water is not yet reliably established. [2, 4]
Exposure does not always mean absorption into organs. A swallowed particle may simply pass through the digestive tract.
Where have researchers found them?
| Human sample | What has been reported—and what it does not establish |
|---|---|
| Stool | Evidence that particles can pass through the digestive tract; this does not show how much was absorbed. |
| Blood | A small study of 22 volunteers reported plastic polymers in blood samples. It did not establish a population-wide health risk. |
| Lung tissue | Researchers detected microplastics in a study of 13 tissue samples. |
| Artery plaque | A study examined particles in surgically removed carotid plaques and subsequent cardiovascular outcomes. |
| Liver, kidneys and brain | A 2025 autopsy study reported plastic polymers and particles in these tissues. |
Sources: [1, 5–8].
Detection is not a complete map of where plastic “stays.” We still lack reliable human measurements of uptake, movement between tissues and clearance over time. Sample contamination, particle identification and differences between analytical methods complicate comparisons. [4, 8, 9]
The brain findings deserve attention, but the researchers explicitly stated that their results did not establish causation. The study also reported uncertainties in estimating polymer concentrations. It does not prove that plastic causes dementia. [8]
What might the particles do?
Laboratory and animal experiments suggest possible effects on inflammation, oxidative stress, cell barriers and immune responses. Some particles may be taken up by immune cells. However, experimental doses and particle types can differ considerably from everyday human exposure. [2, 9]
A notable human study followed 257 patients after surgery for severe carotid artery narrowing. Those with plastic detected in their plaques had a higher subsequent rate of the combined outcome of heart attack, stroke or death. This was an observational association in a selected patient group, not proof that the particles caused these events or that the same risk applies to everyone. [7]
Concern is justified; precise claims about individual disease risk remain premature.
Are thin plastic films the biggest culprit?
We cannot currently identify cling film as the biggest source of human exposure. Thinness alone does not determine release. Material composition, temperature, wear, contact conditions and the food itself all matter.
A 2025 systematic evidence map examined research on plastic food-contact articles. It found evidence of particle release across various products, although study quality and methods differed. The picture includes more than film: containers, bottles, utensils and processing equipment can also be relevant. [3]
It is also important to distinguish plastic particles from plastic-associated chemicals. Chemicals such as certain plasticisers can migrate without visible fragments being present. Different products use different additives; not every plastic contains BPA or the same plasticisers.
Using a glass container or a bowl with a reusable lid instead of cling film is a reasonable precaution. It should not be presented as eliminating our exposure.
Can washing food remove them?
Washing may remove some loosely attached surface particles, but it is not a reliable way to remove all microplastics or nanoplastics.
In a laboratory study, researchers applied very small plastic particles to lettuce leaves and tested cleaning methods. Simple rinsing did not effectively remove the attached particles under those experimental conditions. The study cannot tell us the exact effectiveness of washing every food at home. [10]
Particles within food cannot be washed off its surface. Nor can rinsing reliably undo chemicals that have already migrated into food. Cooking does not reliably destroy plastic particles.
Keep washing fresh produce under safe running water, gently rubbing it where appropriate. This remains useful for ordinary dirt and food hygiene, even though it is not a complete plastic-removal method. Do not use household soap or detergent on food, or wash raw poultry and splash contamination around the kitchen.
There is no need to discard nutritious fruit and vegetables because a rinse cannot guarantee zero particles.
Can we get plastics out of our bodies?
Particles that are not absorbed can leave in stool. The airways can clear some inhaled material through mucus. However, clearance of particles that reach tissues—particularly the smallest particles—is poorly understood in humans. [2, 8]
No established clinical treatment has been shown to safely clear microplastics and nanoplastics from human organs. Claims for detox supplements, fasting, sauna sessions or special drinks go beyond the evidence. Normal hydration and fibre support health, but have not been shown to wash plastic out of the brain or other organs.
Blood donation, plasma exchange and commercial “blood cleaning” should not be pursued as plastic-removal treatments. Removing a substance from a blood sample, or showing an effect on a different chemical, does not demonstrate safe removal of tissue particles or improved health.
Reducing new exposure is a more practical approach than purchasing an unproven cleanse.
Everyday steps worth considering
- Use glass, ceramic or stainless steel for food storage and serving when convenient. Transfer takeaway food to a suitable dish before reheating.
- Avoid unnecessary heating in plastic. Use a microwave-safe glass or ceramic dish and cover. Follow product instructions when plastic is used; “microwave-safe” does not mean “zero release.”
- Replace badly scratched or degraded food-contact plastics. Avoid reusing disposable packaging for purposes or temperatures it was not designed for.
- Reduce settled dust. Damp dusting, wet mopping and a vacuum with effective particle filtration can reduce dust exposure. These are sensible precautions, not proof of removing plastics already inside the body.
- Choose safe drinking water first. In Thailand, do not switch from bottled water to untreated tap water simply to avoid plastic. If using a filter, check its demonstrated particle-removal performance and maintain it properly; not every filter removes nanoplastics or makes water microbiologically safe.
- Reduce disposable plastic where practical. Loose-leaf tea and reusable storage containers are options, but replacing everything at once is unnecessary.
These choices can reduce avoidable contact; none guarantees a particular reduction in body burden or future disease.
A practical HealthyRetired perspective
Plastic pollution is a real environmental problem, and human exposure deserves serious research. We can take proportionate precautions while continuing to eat well and use safe water.
Replacing food film with a reusable lid is an easy kitchen change. Washing produce remains worthwhile. Neither amounts to a complete solution, and neither needs to become a source of anxiety at every meal.
Less unnecessary plastic, better everyday habits—and no expensive detox promises.
Sources and further reading
- FDA: Microplastics and nanoplastics in foods. Definitions, human samples and measurement limitations; this agency overview is considered alongside independent studies below.
- WHO: Dietary and inhalation exposure to nano- and microplastic particles (2022).
- Food contact articles as a source of micro- and nanoplastics: systematic evidence map (2025).
- German Federal Institute for Risk Assessment: Microplastics—facts, research and open questions.
- Discovery and quantification of plastic particle pollution in human blood (2022).
- Detection of microplastics in human lung tissue (2022).
- Microplastics and nanoplastics in atheromas and cardiovascular events (2024).
- Bioaccumulation of microplastics in decedent human brains (2025).
- Health impacts of microplastic and nanoplastic exposure (2025).
- Lettuce washing and plastic particles: experimental study (2023).
Suggested photograph: vegetables beside a glass storage container with a reusable lid. Avoid illustrations suggesting that a person's organs are visibly filled with plastic. Alt text: “Vegetables and a reusable glass container, illustrating ways to reduce unnecessary plastic contact in the kitchen.”