Chloe Zhang
Plastic pollution is a pressing issue, and it is now clear that microplastics are not just in our environment but also in our bodies. These minuscule plastic particles, which come from degraded plastic products, are found in our blood, organs, tissues, and almost every part of the human body. They are consumed in our food and water and breathed in from the air. Research is ongoing to understand the health risks associated with microplastics in our bodies, as they have been linked to allergic reactions, cell death, inflammation, and poor health outcomes such as cardiovascular disease and low male fertility. The presence of endocrine-disrupting chemicals in plastics is also a concern, as these chemicals can interfere with the body's hormones and have been associated with various diseases. While the extent of the harm caused by microplastics is not yet fully understood, their ubiquity in our bodies and the environment has led to urgent calls for more research and regulation.
| Characteristics | Values |
|---|---|
| How plastics enter the human body | Ingestion, Inhalation |
| Average plastic ingestion per week | 5 grams of microplastics |
| Plastic particles found in | Blood, saliva, breast milk, placenta, brain tissue, lungs, liver, kidneys, testicles, heart |
| Plastic particles carried by | Air, food, water, cosmetics, household dust, clothing, furnishings, food packaging, containers, table salt, cleaning products, rain, seafood, produce |
| Plastic particles linked to | Allergic reactions, cell death, inflammation, lung damage, liver effects, changes in the gut microbiome, altered lipid and hormone metabolism, cardiovascular disease, low male fertility, endocrine disruption, hormone-related cancers, diabetes, obesity, reproductive issues |
| Plastic particles found in infants | Feces, placenta, breast milk |
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What You'll Learn
- Microplastics are in our blood, organs, and tissues
- They are ingested and inhaled, entering the body through food, drink, and air
- Microplastics have been found in placentas, breast milk, and infants' faeces
- Plastics contain thousands of chemicals, many of which are linked to diseases
- The health effects of microplastics on humans are not yet fully understood
Microplastics are in our blood, organs, and tissues
Microplastics are everywhere—in the air, water, soil, food, and even in our bodies. Ingestion and inhalation are the two main entry routes of microplastics into the human body. While the presence of microplastics in our bodies is a growing concern, the extent of their harm to human health is still unknown.
In 2022, scientists from the Netherlands and the UK found microplastics in the lungs of surgical patients and in the blood of anonymous donors. These particles were primarily nanoplastics, smaller than one micrometer in length, and small enough to be inhaled or ingested. While the study did not answer the question of possible harm, it did signal a shift in concern about plastics to the cloud of airborne dust particles we live in.
Microplastics have been found in human organs and tissues, including the placenta, spleen, and lung tissues. Research has shown that particles smaller than 100 μm can penetrate biological barriers and accumulate in various tissues. The size of microplastics is a critical factor in their ability to penetrate human tissues, with smaller particles being more likely to do so. In addition, microplastics can absorb and accumulate environmental contaminants and act as vectors of bodily contaminants. They can also circulate in the bloodstream and potentially accumulate in various organs.
The potential health effects of microplastics in the human body are still being studied, but there is reason for concern. In laboratory tests, microplastics have been shown to cause damage to human cells, including allergic reactions and cell death. Microplastics could also be considered a form of air pollution, which is known to induce stress in our lungs. Furthermore, microplastics in the ocean can serve as safe havens for germs, and studies are investigating whether they could spread pathogens and increase infection rates in people.
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They are ingested and inhaled, entering the body through food, drink, and air
Microplastics are now found in almost every part of the human body, including our organs, tissues, blood, saliva, breast milk, placenta, testicles, hearts, livers, kidneys, brains, and lungs. Ingestion is the primary route of exposure, and we are estimated to consume about 5 grams of microplastics per week. Microplastics have been detected in our food and drink, including fruits and vegetables, bottled water, beer, seafood, and baby formula. They have also been found in the air we breathe, with concentrations of up to 15 particles per cubic meter of indoor air.
Microplastics are minuscule plastic particles that come from degraded plastic products. They range in size from 1 nanometer to 5 millimeters. The production and destruction of plastics generate these particles, which contribute to climate change and release greenhouse gases. As plastic waste continues to increase, the threat to human health from microplastics may also escalate.
Microplastics can enter our bodies through ingestion and inhalation. When we eat and drink contaminated food and water, we directly ingest microplastics. They can also be inhaled as airborne particles, penetrating deep inside our bodies and even our cells. Breathing motions have been found to increase the absorption of plastic particles in the lungs, making inhalation a significant route of exposure.
In addition to ingestion and inhalation, microplastics can enter our bodies through other means. For example, they can be absorbed through the skin or transferred from mother to child during pregnancy or breastfeeding. Research has detected microplastics in placentas and breast milk, indicating potential exposure to unborn babies and infants.
The presence of microplastics in our bodies has raised concerns about their potential health impacts. While the exact effects are still being studied, laboratory tests have shown that microplastics can cause damage to human cells, including allergic reactions and cell death. They have also been associated with poor health outcomes, such as cardiovascular disease and low male fertility. Additionally, microplastics may carry toxic chemicals, bacteria, and viruses that can have adverse effects on our health.
As awareness of the presence of microplastics in our bodies grows, there is a heightened concern about preventing further exposure and understanding the potential health risks. While the extent of the harm caused by microplastics is not yet fully understood, their ubiquity in our environment and bodies underscores the urgency for further research and regulation.
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Microplastics have been found in placentas, breast milk, and infants' faeces
Microplastics have been detected in human placentas, according to a 2020 Italian study. This discovery adds to the growing evidence of the presence of microplastics in the human body, raising concerns about their potential impact on infant health. Subsequently, in 2022, microplastics were identified in human breast milk for the first time, further increasing worries about infant exposure to these particles during early life stages.
The detection of microplastics in placentas indicates that these particles can cross the placental barrier and enter the fetus's body. This finding has significant implications for understanding the potential health risks associated with microplastic exposure during pregnancy and the possible long-term effects on fetal development. The study by Liu et al. (2023) analysed placentas and meconium at birth and found the presence of microplastics, highlighting the need for further research to identify exposure sources and assess potential health consequences.
Breast milk, a critical source of nutrition for newborns, has also been found to contain microplastics. This discovery has raised concerns among researchers, particularly due to the vulnerability of infants. The Italian team that identified microplastics in breast milk emphasised the urgency of addressing this issue, as infants are highly susceptible to chemical and particle exposure during their early development stages. While the specific risk factors remain unidentified, the ubiquitous presence of microplastics in the environment suggests that human exposure is inevitable.
In addition to placentas and breast milk, microplastics have also been detected in infant faeces, further confirming infant exposure to these particles. A study by Zhang et al. (2021b) found significantly higher concentrations of polyethylene terephthalate (PET) in infant faeces compared to adults, indicating higher exposure levels in infants. The sources of exposure for infants include not only breast milk but also the use of plastic feeding bottles and teething toys, contributing to their overall microplastic exposure.
The presence of microplastics in placentas, breast milk, and infant faeces underscores the widespread nature of microplastic contamination and the urgency of addressing this global issue. While the health impacts of microplastics are not yet fully understood, the scientific community is actively researching this topic to identify potential risks and develop strategies to minimise human exposure, particularly during sensitive developmental stages such as pregnancy and infancy.
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Plastics contain thousands of chemicals, many of which are linked to diseases
Plastic is now found in our bodies, and it is not just destroying our environment. We are consuming about 5 grams of microplastics per week, according to research scientist Mary Johnson. This is a growing concern as microplastics can enter the body through inhalation and ingestion.
Microplastics have been detected in the lungs of surgical patients and the blood of anonymous donors, signalling a shift in concern about plastics. Laboratory tests have shown that microplastics can cause damage to human cells, including allergic reactions and cell death. A 2018 study found microplastics in the faeces of eight people, and another study documented their presence in the placentas of unborn babies.
Plastics contain thousands of toxic chemical additives, many of which are unregulated. These chemicals can leach out and expose people to harmful substances. They can also bind and accumulate toxic chemicals from the environment, acting as carriers for toxic compounds. These chemicals are known as endocrine-disrupting chemicals (EDCs) and can interfere with the body's hormones, causing multiple health problems. EDCs have been linked to infertility, obesity, diabetes, prostate or breast cancer, thyroid problems, and an increased risk of cardiovascular disease and stroke.
In addition, chemicals found in food packaging, plastics, and personal care products such as lotions and shampoos have been linked to hundreds of thousands of deaths from heart disease. These chemicals, known as phthalates, were responsible for over 350,000 deaths worldwide in 2018, with about 75% of deaths occurring in Asia, the Middle East, and the Pacific. Phthalates are believed to create excess inflammation in the body and are linked to other conditions that increase heart disease mortality, such as obesity and high blood pressure.
The health impacts of plastics are still a relatively new research area, but the scientific results to date indicate that plastics cause diseases, disabilities, and premature death at every stage of their life cycle. Vulnerable groups, including children, women, and marginalized communities, are particularly exposed, raising concerns about human rights and environmental injustice.
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The health effects of microplastics on humans are not yet fully understood
Research on the health effects of microplastics on humans is still in its early stages. While studies have detected microplastics in human blood, lung tissue, feces, and placentas, the impact of these particles on human health is not yet clear. There have been no large-scale epidemiological studies documenting a connection between microplastic exposure and health impacts in a large group of people.
However, laboratory tests and animal studies have shown that microplastics can cause damage to human cells, including allergic reactions, cell death, oxidative stress, DNA damage, and changes in gene activity, which are known risk factors for cancer development. Microplastics have also been linked to endocrine disruption, metabolic disorders, developmental disorders, and reproductive issues.
The extent of microplastic exposure and the levels that are toxic to humans are still being investigated. The analytical tools and techniques required to study the smallest plastics, known as nanoplastics, are still being developed. There are concerns that microplastics may carry antibiotic-resistant bacteria and other pathogens, increasing the risk of infections.
As our knowledge of microplastic exposure and health effects evolves, it is essential to minimize plastic use and advocate for improved plastic recycling and alternative biodegradable options to reduce potential health risks.
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Frequently asked questions
There are two main entry routes for plastics into the human body: swallowing them and breathing them in. Plastic particles have been found in our food, water, and air.
The plastics found in our bodies are typically microplastics, which are smaller than 5mm, and nanoplastics, which are smaller than 1 micrometer.
The health effects of plastics in our bodies are not yet fully understood. However, studies have shown that plastics can cause damage to human cells, including allergic reactions and cell death. Plastics contain thousands of chemicals, many of which are linked to diseases such as cancer, cardiovascular disease, and low male fertility.
