Maya Ellison
Plastics and metals are ubiquitous in modern life. Humans are exposed to plastics through inhalation, ingestion, and direct skin contact, and to metals through dental restorations, orthopedic implants, food, vaccines, and jewelry. While the health impacts of exposure to plastics and metals are still being researched, there is evidence that both can cause inflammation in the body. For example, microplastics have been linked to inflammatory bowel disease symptoms and respiratory complications, while metal-induced inflammation has been associated with chronic fatigue syndrome and fibromyalgia. With the pervasive presence of plastics and metals in our environment, understanding their potential effects on human health is of utmost importance.
Plastics and metals causing inflammation
| Characteristics | Values |
|---|---|
| Plastics causing inflammation | Microplastics have been found to enter the gastrointestinal tract and pulmonary system and cause inflammation. They have also been linked to inflammatory bowel disease symptoms and respiratory complications. |
| Plastics contain toxic chemicals that can cause diseases, disability, and premature death. | |
| Plastics can act as a vessel for human pathogens, increasing the risk of disease. | |
| Metals causing inflammation | Metals can trigger inflammation, especially in metal-allergic patients. |
| Metals can cause an abnormal immune response, including allergies and autoimmunity. | |
| Non-essential heavy metals are regarded as potent toxins that can trigger harmful inflammation, accompanied by organ dysfunction and disease. | |
| Cadmium, a toxic metal, can induce inflammation through innate immune responses, modulation in terms of susceptibility to microbial infections, and the release of cytokines and chemokines. | |
| Metals present in tobacco smoke can cause a pro-oxidant/antioxidant imbalance, leading to inflammation. |
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What You'll Learn
- Cadmium, a heavy metal, induces inflammation through tissue damage and free radical generation
- Metal-bound proteins are recognised by the immune system and can trigger abnormal responses
- Microplastics are found in human stool, indicating ingestion and potential health risks
- Plastic particles can cross the gut barrier and travel through the body, causing inflammation
- Toxic chemicals in plastics are linked to a range of health issues, including cancer and endocrine disruption
Cadmium, a heavy metal, induces inflammation through tissue damage and free radical generation
While plastics are a recent invention, having only been produced on a large scale since the 1950s, they have become ubiquitous in modern life. As plastic waste skyrockets, so too do the threats to human health, with studies suggesting that microplastics disrupt marine microorganisms' crucial roles of sequestering carbon dioxide and producing oxygen.
However, the specific question of whether plastics cause inflammation is still under investigation. While there haven't been any definitive studies, researchers have identified several red flags. For example, in one study, scientists used "clean" plastic particles, free of known toxic chemicals, bacteria, and viruses, and observed negative effects on mice, possibly due to the immune system recognizing the presence of a foreign invader and triggering inflammation.
On the other hand, heavy metals, such as cadmium, are known to induce inflammation through tissue damage and free radical generation. Cadmium is a toxic heavy metal that targets the lung, liver, kidney, and testes following acute intoxication, and causes nephrotoxicity, immunotoxicity, osteotoxicity, and tumors after prolonged exposure. In rodent models, cadmium can induce hypertension and increase atherosclerotic plaque development. It has also been associated with obstructive airway disease, emphysema, irreversible renal failure, bone disorders, and immuno-suppression.
At the cellular level, cadmium affects proliferation, differentiation, and apoptosis, and has been classified as a carcinogen by the International Agency for Research on Cancer (IARC). Cadmium exposure can induce oxidative stress, lipid peroxidation, ion homeostasis disruption, inflammation, cell death, and fibrosis. It is a catalyst in the formation of reactive oxygen species (ROS), which play a role in tissue damage and free radical generation. In addition, cadmium can substitute for zinc, iron, and copper in proteins, leading to an imbalance in free radicals and the activation of inflammatory pathways.
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Metal-bound proteins are recognised by the immune system and can trigger abnormal responses
While there is no scientific consensus on the amount of plastic humans ingest, estimates range from 0.1 to 5 grams per week, with inhalation of airborne microplastics ranging from 26 to 170 MNPs per day and up to 22,000,000 micro- and nanoplastics inhaled annually. The health impacts of plastics are a relatively new area of research, but studies indicate that plastics cause diseases, disabilities, and premature death at every stage of their life cycle. The toxic chemical additives and pollutants found in plastics pose a global threat to human health. Health effects with scientific backing include cancer and endocrine disruption, which can lead to reproductive, growth, and cognitive impairment.
The immune system is a complex network of cells, chemicals, and proteins that work together to protect the body from harmful substances, such as antigens. Antigens are usually proteins found on the surface of cells, viruses, fungi, or bacteria, but they can also be non-living substances like toxins, chemicals, drugs, or foreign particles. The immune system has two main components: the innate (general) immune system and the adaptive (specialized) immune system. The innate immune system acts as the body's first line of defence, responding rapidly to all types of germs and foreign substances. It employs various mechanisms, including physical barriers, immune cells, and proteins, to prevent the entry and spread of harmful substances.
Metal-bound proteins are recognised by the immune system, and their presence can trigger abnormal responses. The immune system's ability to distinguish foreign substances relies on the recognition of antigens by antibodies, which are proteins produced by B cells. These antibodies have specific shapes that allow them to bind to matching antigens, rendering them harmless and facilitating their destruction by other immune cells. This process is crucial for protecting the body against harmful invaders.
In the case of metal-bound proteins, the immune system's recognition of these substances can sometimes lead to an abnormal response. This abnormal response can be understood through the concept of hypersensitivity reactions, specifically type I and type IV. Type I hypersensitivity reactions are characterised by the production of IgE antibodies, which bind to receptors on tissue mast cells and blood basophils, causing sensitisation. Subsequent exposure to the same allergen triggers the release of active mediators, resulting in inflammation and tissue changes. Type IV reactions, on the other hand, are cell-mediated and antibody-independent, caused by the overstimulation of T cells and monocytes/macrophages, leading to cytokine release, inflammation, cell death, and tissue damage.
The presence of metal-bound proteins can act as antigens, triggering these hypersensitivity reactions and leading to abnormal responses by the immune system. This abnormal response can manifest as inflammation, cell death, and tissue damage, similar to the effects observed in type I and type IV hypersensitivity reactions. While the specific mechanisms involved in the immune system's response to metal-bound proteins require further investigation, it is clear that the presence of certain metals can induce an abnormal immune response, contributing to inflammation and potentially other health complications.
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Microplastics are found in human stool, indicating ingestion and potential health risks
Microplastics are tiny plastic particles, smaller than 5mm, that are formed as plastic degrades. They are found everywhere, from trash and dust to fabrics, cosmetics, cleaning products, and food. Microplastics have also been detected throughout the human body, including in blood, saliva, the liver, kidneys, and stool.
A 2018 study found microplastics in human stool samples from countries in many parts of the world, suggesting inadvertent ingestion from different sources. All eight stool samples tested positive for microplastics, with a median of 20 microplastics per 10g of human stool. Polypropylene and polyethylene terephthalate, which are major components of plastic bottle caps and plastic bottles, were the most common types detected.
The presence of microplastics in human stool indicates ingestion, which can occur through consuming food and beverages packaged or served in plastic. While the health effects of microplastics on humans are not yet fully understood, there are concerns about potential risks. Some studies in animals have found that plastic particles can cross the gut barrier and travel through the body, potentially affecting organs and causing inflammation. Additionally, the additives in plastics are known endocrine disruptors, which can lead to reproductive, growth, and cognitive impairments.
To minimize exposure to microplastics, individuals can avoid using plastic products, such as plastic bottles, and opt for alternatives like glass, stainless steel, or biodegradable materials. Regulatory bodies and manufacturers also have a responsibility to reduce microplastic exposure, for example, by requiring filters in washing machines to catch microplastics from clothing or reducing the use of plastic in products. More research is needed to fully understand the health risks associated with microplastic ingestion and to guide effective policies and regulations.
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Plastic particles can cross the gut barrier and travel through the body, causing inflammation
The human body is inadvertently exposed to plastic particles through inhalation, ingestion, and direct skin contact. These plastic particles, known as microplastics, are smaller than 5 millimeters and are released as plastic degrades. While the health impacts of microplastics on humans are still being studied, research to date indicates that they can cause diseases, disabilities, and even premature death.
Several studies on animals have shown that plastic particles can cross the gut barrier and travel through the body. For example, in a study conducted by Castillo and his team, microplastics were found to have migrated from the gut into the tissues of the liver, kidney, and brain of mice. This indicates that microplastics can indeed cross the intestinal barrier and infiltrate other tissues.
Furthermore, microplastics have been shown to impact the gut's immune system. In a study by Castillo and other UNM researchers, it was found that when macrophages (immune cells that protect the body from foreign particles) encountered and ingested microplastics, their function was altered, and they released inflammatory molecules. This suggests that microplastics can trigger an inflammatory response in the body.
In addition to animal studies, human cell studies have also indicated a link between the presence of microplastics in the body and inflammatory symptoms. For instance, researchers have found a correlation between microplastics in the human body and inflammatory bowel disease symptoms, respiratory complications, and other health issues that require further investigation.
While the exact mechanisms and health effects of microplastics are still being elucidated, the available evidence suggests that plastic particles can cross the gut barrier, travel through the body, and cause inflammation. This growing body of research underscores the importance of reducing microplastic exposure and improving plastic production and filtration methods to minimize potential health risks.
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Toxic chemicals in plastics are linked to a range of health issues, including cancer and endocrine disruption
Plastic is everywhere, and it often contains toxic chemicals that can leach out and expose people to significant health risks. These chemicals are known as endocrine-disrupting chemicals (EDCs) and are linked to a range of diseases and health issues.
EDCs are chemicals that interfere with the body's hormone systems, causing endocrine disruption. This can lead to a variety of health issues, including reproductive disorders, infertility, neurodevelopmental problems, metabolic disorders, and an increased risk of certain cancers. For example, early life exposure to brominated flame retardants, found in plastics and various consumer products, has been linked to reduced IQ and ADHD in children. Similarly, vinyl chloride, a compound used to make certain plastics, can increase the risk of specific cancers. Researchers have also found that microplastic exposure is linked to issues with male fertility, biomarkers of colon and gut cancer, and potential respiratory problems.
The health effects of toxic chemicals in plastics are not limited to direct exposure. Microplastics, for instance, can bind and accumulate toxic chemicals from the surrounding environment, such as seawater and sediment, acting as carriers of these toxic compounds. As microplastics are ubiquitous in the environment, they can be ingested, inhaled, or come into direct contact with human skin, leading to potential health issues.
While the specific mechanisms of these health impacts are still being studied, the presence of microplastics in the human body has been correlated with inflammatory bowel disease symptoms, respiratory complications, and potential inflammation triggered by the immune system recognizing foreign invaders. These health issues are not limited to adults, as vulnerable groups, including children, pregnant people, and marginalized communities, are particularly susceptible to the toxic chemicals in plastics.
As plastic waste continues to skyrocket, the threats to human health may also escalate. Therefore, it is essential to recognize the potential dangers of toxic chemicals in plastics and take steps to reduce exposure and mitigate their impact on human health and the environment.
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Frequently asked questions
While there is no scientific certainty, studies on animals indicate that plastic particles can cause inflammation.
Metals can trigger an abnormal immune response, including allergy and autoimmunity, which can lead to inflammation.
The toxic chemical additives and pollutants found in plastics threaten human health. Scientifically-proven health effects include causing cancer, metabolic disorders, attention deficit/hyperactivity disorder, and fertility issues.
Metal-induced inflammation can cause fibromyalgia in metal-allergic patients and may play a role in chronic fatigue syndrome.
To reduce exposure to plastics, one can avoid using plastic water bottles, microwaving food in plastic containers, and limit contact with common items containing plastics such as clothing, cosmetics, and cleaning products. To reduce exposure to metals, one can be mindful of common sources such as dental restorations, orthopedic implants, food, vaccines, and jewelry.
