Ethan Clarke
Plastic is everywhere—in the air, water, soil, and food we eat. It is also in our bodies. In the past 20 years, scientists have found plastic particles, called microplastics, in the bodies of fish, birds, sea turtles, and humans. Microplastics have been found in human blood, the placenta, and, most recently, in the lungs of living people for the first time. While the long-term effects of microplastics on the human body are still unknown, there is a growing body of evidence pointing to the health risks posed by plastic.
| Characteristics | Values |
|---|---|
| How plastics enter the human body | Ingestion, inhalation, dermal exposure |
| Plastics found in the human body | Blood, placenta, lungs, digestive system |
| Health issues | Cancer, lung disease, birth defects, inflammation, genotoxicity, oxidative stress, apoptosis, necrosis, cardiovascular disease, inflammatory bowel disease, diabetes, rheumatoid arthritis, chronic inflammation, auto-immune conditions, neuro-degenerative diseases, stroke |
| Other effects | Endocrine disruption, weight gain, insulin resistance, decreased reproductive health, cell death, allergic reactions, tissue damage |
| Vulnerable groups | Workers in plastic manufacturing and disposal, marginalized communities, children and infants |
| Plastic waste management technologies | Incineration, co-incineration, gasification, pyrolysis |
| Impact of plastic waste management technologies | Release of toxic metals, organic substances, acid gases, and other toxic substances into the air, water, and soil |
| Impact of plastic pollution | Threat to human, plant, and animal health, contributes to climate change, clogs land, air, and waterways |
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What You'll Learn
- Microplastics enter the body through ingestion, inhalation, and skin absorption
- Microplastics cause inflammation, oxidative stress, and genotoxicity
- Plastic waste management releases toxic metals and gases
- Plastic is found in the environment, food, and water
- Plastic is linked to cancer, lung disease, and birth defects
Microplastics enter the body through ingestion, inhalation, and skin absorption
Plastic is a global threat to human health, and microplastics can enter the human body through ingestion, inhalation, and skin absorption.
Ingestion
Microplastics can be ingested through drinking water, which can be contaminated at the source, during treatment, distribution, or from packaging in the case of bottled water. Seafood is also a source of ingestion, as microplastics have been found in the muscle tissue of fish, not just the gut, and are likely to be consumed when people eat seafood. Microplastics have also been found in human breast milk, and infants have been found to have more microplastic particles in their feces than adults.
Inhalation
Microplastics are present in the air, with higher concentrations found indoors compared to outdoors. They can enter the respiratory system through the nose or mouth before being deposited in the upper airways or deep in the lungs. Once in the lungs, they can be transferred to lung tissue and potentially to internal organs and the vascular system. Inhaled particles may irritate and damage the lungs, similar to the damage caused by other particulate matter.
Skin Absorption
Microplastics can also be absorbed through the skin, with sweaty skin being more susceptible to absorption than dry skin, except for BDE 47, which is more readily absorbed when the skin is dry. Researchers found that the skin could absorb up to 8% of the exposure dose, with five flame retardant chemicals detected in the skin, although the amount that entered the bloodstream was very low (<0.14%).
The health impacts of microplastics in the body are still being researched, but they have been linked to inflammation, genotoxicity, oxidative stress, apoptosis, and necrosis, which are associated with various negative health outcomes, including cancer, cardiovascular disease, inflammatory bowel disease, diabetes, and autoimmune conditions.
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Microplastics cause inflammation, oxidative stress, and genotoxicity
Plastic waste is a pressing issue, as it contaminates the environment and threatens human health. Microplastics, in particular, have been detected in food and air, and can enter the human body through ingestion or inhalation, leading to various adverse health effects.
Microplastics can cause inflammation, which is linked to an array of inflammatory-related diseases. In the digestive system, microplastics can cause physical irritation to the gastrointestinal tract, resulting in gastrointestinal symptoms such as abdominal pain, bloating, and altered bowel habits. Additionally, microplastics can trigger an immune response, leading to chronic inflammation and autoimmune conditions.
Oxidative stress is another consequence of microplastic exposure. This occurs when there is an imbalance between free radicals and antioxidants in the body, resulting in damage to cells, tissues, and organs. Microplastics have been found to increase reactive oxygen species (ROS) production, contributing to oxidative stress and accelerating the aging process.
Genotoxicity is a significant concern regarding microplastics. Microplastics can cause clastogenesis and aneugenesis, resulting in chromosome damage and failures in chromosome segregation. They can also directly interact with DNA, causing fractures and damage. These effects can lead to reproductive health issues and cancer development. The genotoxicity of microplastics appears to be size- and dose-dependent, with smaller microplastics more easily penetrating cell membranes and accessing genetic material.
Overall, the presence of microplastics in the environment and the human body has harmful consequences for human health. The complex and intersecting impacts of plastics at every stage of their lifecycle highlight the urgent need for a comprehensive approach to address this global health crisis.
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Plastic waste management releases toxic metals and gases
Plastic waste management is a critical issue that poses significant risks to human health and the environment. The improper disposal of plastics through incineration, co-incineration, gasification, and pyrolysis releases toxic metals and gases, exacerbating the problem. These processes emit harmful substances such as lead, mercury, dioxins, furans, and acid gases, which contaminate the air, water, and soil. This contamination leads to direct and indirect exposure for workers and nearby communities, who may inhale contaminated air, come into contact with polluted soil or water, or consume contaminated food.
The release of toxic metals and gases from plastic waste management has far-reaching consequences. These toxins can travel long distances, depositing in soil and water systems. Over time, they accumulate in the tissues of plants and animals, eventually entering the human food chain. This bioaccumulation results in the concentration of toxic chemicals, which can have detrimental effects on human health.
Microplastics, tiny plastic particles resulting from the breakdown of larger plastic pieces, pose a significant health risk. They can enter the human body through ingestion, inhalation, or dermal exposure. Studies have found microplastics in human blood, the placenta, and even lung tissues, indicating that they can penetrate deep into our bodies. The presence of microplastics in the human body has been linked to various health issues, including inflammation, genotoxicity, oxidative stress, apoptosis, and necrosis. These issues are associated with negative health outcomes such as cancer, cardiovascular diseases, inflammatory bowel disease, diabetes, rheumatoid arthritis, chronic inflammation, autoimmune conditions, neurodegenerative diseases, and stroke.
The impact of plastic waste on the environment is also concerning. Plastic pollution alters habitats and natural processes, reducing ecosystems' ability to adapt to climate change. It affects biodiversity, directly influencing millions of people's livelihoods, food production capabilities, and social well-being. Additionally, plastic waste entering aquatic ecosystems through rivers and oceans contributes to the growing presence of microplastics in marine life, which eventually makes its way into our food chain.
To address the global plastic crisis, it is imperative to reduce plastic production, use, and disposal. This includes improving waste management systems, promoting recycling, and reducing the manufacturing of single-use plastics. By taking a lifecycle approach to plastic and its impact on human health, we can make informed decisions to protect the environment and safeguard current and future generations from the toxic effects of plastic pollution.
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Plastic is found in the environment, food, and water
Plastic is everywhere—in the environment, food, and water. It is a synthetic, organic polymer made from fossil fuels, such as gas and petroleum. Over 460 million metric tons of plastic are produced annually, according to the United Nations Environment Programme.
Plastic is used in almost all consumer and industrial activities, from construction and transportation to electronics, medicine, and agriculture. However, the problem of plastic waste is a significant one. An estimated 20 million metric tons of plastic waste end up in the environment each year, polluting all ecosystems, including land, freshwater, and marine environments.
Plastic waste is a major driver of biodiversity loss and ecosystem degradation, and it threatens human health, food and water safety, economies, and contributes to climate change. Once in the ocean, it is extremely difficult to retrieve. While mechanical systems can be effective at collecting large pieces of plastic from inland waters, once plastics break down into microplastics, they are virtually impossible to recover. These microplastics spread throughout the water column and have been found in every corner of the globe, from the highest peaks to the deepest ocean trenches.
Microplastics have also been found in human blood, placentas, and in food and drinks, including tap water, beer, and salt. They enter the human body through ingestion, inhalation, and dermal exposure. The health impacts of microplastics include inflammation, genotoxicity, oxidative stress, apoptosis, and necrosis, which are linked to negative health outcomes such as cancer, cardiovascular disease, inflammatory bowel disease, diabetes, rheumatoid arthritis, chronic inflammation, auto-immune conditions, neurodegenerative diseases, and stroke.
The complex and intersecting human health impacts of plastic occur at every stage of its lifecycle, from production to disposal and ongoing impacts as air, water, and soil pollution. To address the global plastic crisis, a reduction in plastic production, use, and disposal is necessary.
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Plastic is linked to cancer, lung disease, and birth defects
Plastic is a human-made material that has become ubiquitous in the environment and is now found even in the most remote regions of the planet. Plastic pollution is a global issue, and its impact on human health is a growing concern.
Cancer
Microplastics and nanoplastics have been identified as potential carcinogens, with the ability to cause DNA damage and initiate carcinogenesis. Studies have found that plastic particles can be absorbed by the human body, mainly through inhalation and ingestion, leading to a dangerous accumulation of these substances. This exposure has been linked to various cancers, including cancers of the pancreas, liver, and bile duct. The presence of plastic additives in the body, such as bisphenol A, has also been correlated with an increased incidence of certain cancers and related diseases, such as COPD.
Lung Disease
Exposure to plastic materials, particularly during their manufacturing, processing, or recycling, has been associated with an increased risk of lung abnormalities, including malignancies and interstitial lung diseases (ILDs). The presence of plastic dust and fumes can contribute to cellular damage and mutations within lung tissue, potentially triggering the development of ILDs and lung cancer. Inhalation of elevated levels of plastic particles has been linked to interstitial inflammation and pulmonary fibrosis, underscoring the potential harm of plastic pollution on respiratory health.
Birth Defects
Microplastics have been detected in the placentas of unborn babies, raising concerns about the potential impact on fetal development. While the babies in the study had normal births, researchers flagged this as a "worrying concern." The presence of plastic particles in the placenta may lead to reduced fetal growth and potentially trigger immune responses or the release of toxic contaminants, resulting in harm to the developing fetus. The study also highlights that babies are being born "pre-polluted," indicating the pervasiveness of plastic pollution and its impact on vulnerable populations.
The health impacts of plastic are complex and far-reaching, and the full scope of its toxic effects is yet to be fully understood. Addressing this crisis requires a comprehensive lifecycle approach to plastic production, use, and disposal, as well as increased transparency around the chemicals and processes involved in plastic manufacturing.
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Frequently asked questions
Microplastics are tiny particles of plastic that are found in the environment and in human bodies. They are created when larger pieces of plastic break down and are transported long distances through soil and wind.
Microplastics can enter the human body through ingestion, inhalation, and dermal exposure. They have been found in contaminated food and water, as well as in the air we breathe.
The health effects of microplastics on the human body are still being studied, but current research suggests that they can cause inflammation, genotoxicity, oxidative stress, apoptosis, necrosis, and cytotoxicity (death of cells). Microplastics have also been linked to various diseases, including cancer, lung disease, inflammatory bowel disease, diabetes, and cardiovascular disease.
To reduce your exposure to microplastics, you can limit your use of single-use plastics, opt for reusable and recyclable products, and support policies and initiatives that aim to reduce plastic pollution.
Microplastics come from a variety of sources, including plastic waste that has broken down over time, industrial processes that release plastic particles into the air and water, and the use of plastic products that shed microplastics, such as synthetic clothing.
