Omar Khalid
Plastic ingestion is a growing concern for humans and wildlife alike. Microplastics, which are small plastic particles, have been found in various marine organisms, including fish and shellfish, highlighting the risk of ingestion by humans and other animals. These microplastics can enter the human body through ingestion of food and drinks, including fish, fruits, vegetables, meat, cereals, legumes, and water. The impact of plastic ingestion on human health is not yet fully understood, but research suggests it could be harmful, with potential health risks including oxidative stress, immune disease, and an increased risk of cancer. Furthermore, the accumulation of microplastics in the environment, particularly in lakes, canals, and megacities, poses a threat to local communities through drinking water and food chains. While the full extent of the harm caused by plastic ingestion is still being studied, it is clear that plastic is climbing food chains and measures such as recycling, reducing plastic use, and reusing materials can help mitigate this issue.
| Characteristics | Values |
|---|---|
| How does plastic enter the food chain? | Plastic enters the food chain when animals eat or ingest contaminated food materials. |
| Which animals are affected by plastic in the food chain? | The number of individual animals affected by plastic would be very difficult to estimate but would run into the billions. |
| Which types of plastics enter the food chain? | Microplastics, nanoplastics, and plastic additives. |
| Where are these plastics found? | They have been found in the atmosphere, soil, water bodies, and in food and drink. |
| How do plastics affect human health? | Microplastics can affect human health by damaging tissues and might carry other toxic chemicals and microorganisms. They can also induce several adverse health effects including lethality, mental and reproduction problems, intestinal damage, immune problems, and neurotoxicity. |
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What You'll Learn
Microplastics are ingested by marine and terrestrial organisms
Microplastics are small plastic particles that come from the degradation of plastics. They are ubiquitous in nature and can be found in the atmosphere, soil, and water bodies. The widespread use and durability of synthetic polymers have led to plastic debris occurring worldwide, with microplastics infiltrating every part of the planet. As a result, both marine and terrestrial organisms ingest microplastics, which can have harmful consequences for their health and ecosystems.
Marine Organisms
Microplastics have been detected in many marine species, including fish and shellfish. In the Gulf of Mexico, a study found that 29% of crustaceans and 26% of fish collected had ingested at least one microplastic particle. The study also revealed that the deeper these organisms lived in the ocean, the more plastic they consumed. This is concerning as these non-migratory organisms are exposed to plastic for their entire lives. Laboratory experiments have also demonstrated the ingestion of microplastics by various marine invertebrates, including ciliates, cnidarians, rotifers, annelids, copepods, cladocerans, amphipods, mysids, euphausiids, barnacles, mussels, and tunicates.
Terrestrial Organisms
Microplastics have been found in soils on land and can contaminate plants, such as wheat and lettuce. They accumulate in the roots of plants, particularly impacting root and tuber vegetables. Studies have shown that the presence of microplastics can interfere with the proper absorption of nutrients and water by plant roots, altering the biomass of plants and the characteristics of their roots. This can have consequences for terrestrial organisms that consume these plants. For example, ingesting larger amounts of microplastics can cause intestinal damage to earthworms and reduce their survival rates.
The ingestion of microplastics by marine and terrestrial organisms has significant implications for human health as these organisms are part of our food chain. Microplastics can carry health hazard contaminants and affect the entire ecosystem. While the specific mechanisms are still being studied, research suggests that ingesting microplastics can lead to cellular toxicity, oxidative stress, immune disease, and an increased risk of cancer in humans.
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Plastic carries toxins that accumulate in animal fat and tissue
Plastic and microplastics have been found in the deepest parts of the ocean, in the guts of marine animals, in drinking water, in the air, and in human and animal tissue. Plastic has entered the food chain through fish and other marine animals, and it is estimated that billions of individual animals are affected by plastic.
In addition to the environmental pollutants that bind to plastic, chemicals are often added to plastic during the production process. These chemicals can leak from the plastic, even when the plastic is inside the body of an animal. Studies have shown that these chemicals can disrupt the endocrine system and the hormones that regulate growth and development. They have also been linked to a range of health problems, including cancer, heart disease, and poor foetal development.
Microplastics have been found to accumulate in human brains, with unknown consequences for human health. Studies have also found correlations between the presence of microplastics in the human body and inflammatory bowel disease symptoms, respiratory complications, cellular toxicity, and neurotoxicity.
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Plastic additives have been found in animal tissue
Plastic has entered the food chain, with animals carrying microplastics in their bodies. When these animals are eaten, the microplastics are passed on to the animal that ate them, and so on. This process is called 'trophic transfer'.
Animals eat plastic every day. Turtles, for example, mistake plastic bags for food, and whales have been found with plastic in their stomachs. Plastic floating in the sea and balloons released into the air can entangle animals.
In 2015, Dutch researchers found that the number of marine species that swallow or get caught in plastic had doubled since 1997, from 267 to 557. This number is now believed to be above 2000, though only a limited number of animal species have been investigated.
Microplastics have been found in the guts of marine animals inhabiting the deepest ocean trenches, and in drinking water around the world. They have also been found in the atmosphere, soil, and water bodies.
A study by UC Santa Barbara's National Center for Ecological Analysis and Synthesis (NCEAS) found that toxic concentrations of pollutants and additives enter the tissue of animals that have eaten microplastics. Another study found that triclosan, an antibacterial additive, has been found in animal studies to alter hormones.
The impact of ingesting plastics on human health is not yet fully understood, but research suggests it could be harmful. Chemicals added during the production of plastics can disrupt the endocrine system and the hormones that regulate growth and development. These chemicals have also been linked to cancer, heart disease, and poor foetal development.
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Plastics enter the food chain when they degrade
MPs in the environment can contaminate food and water sources, leading to their ingestion by humans and other organisms. Marine organisms, such as fish and mussels, can ingest microplastics directly from seawater or by consuming other contaminated organisms. These contaminated marine organisms are then consumed by humans, leading to the indirect ingestion of microplastics.
Microplastics have also been found in soil and can be taken up by plants, especially in their roots. This is particularly concerning for root and tuber vegetables. Contaminated plants can be consumed directly by humans or by other organisms, leading to the transfer of microplastics to higher levels of the food chain.
The presence of microplastics in the food chain is a potential health risk to humans and other organisms. Microplastics can carry toxic chemicals and microorganisms, which can be transferred to the tissues of animals and humans, impairing key body functions. Studies have linked chemicals found in plastic to endocrine disruption, growth and development issues, cancer, heart disease, and poor foetal development. Additionally, the sharp edges of irregularly shaped microplastics can rupture cell walls, leading to tissue damage.
The impact of microplastics on the environment and human health is a growing concern, and further research is needed to fully understand the risks associated with their presence in the food chain.
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Humans ingest microplastics through food, drink, and plastic products
Plastic has entered the human food chain, with microplastics being ingested through food, drink, and plastic products. Microplastics are plastic fragments smaller than 5mm in size. They are found in the environment, having been released through industrial discharge and the breakdown of larger plastics. These particles are then ingested by marine and terrestrial organisms, which are consumed by humans.
Food is a primary source of microplastic ingestion. Contamination can occur through direct exposure to the environment or the transfer of microplastics within the ecosystem. Fruits and vegetables, for example, absorb microplastics through their root systems, with apples and carrots being highly contaminated. Seafood such as fish and shellfish is also at risk of containing microplastics, as they ingest plastic particles present in the water.
Drinks, including water, beer, and tea, are other significant sources of microplastic ingestion. Bottled water, in particular, may lead to the consumption of up to 90,000 microplastics annually, compared to 4,000 for those consuming tap water. Tea, when prepared with plastic tea bags, releases billions of microplastic and nanoplastic particles into the beverage. Beer, made from water and crops, is also contaminated, with about 28 microplastic particles per liter.
In addition to food and drinks, plastic products themselves can be a source of microplastic ingestion. Synthetic fabrics, for instance, contribute to the presence of plastic particles in the human body through skin contact and inhalation. Plastic packaging is another often-overlooked source of microplastics, with plastic contaminating the food it contains.
The health effects of microplastic ingestion are still being researched, but initial findings suggest potential harm. High levels of ingested microplastics have been linked to cell damage, inflammation, and allergic reactions. The variance in types, sizes, and shapes of plastic particles may also lead to health issues, including oxidative stress, immune disease, and an increased risk of cancer.
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Frequently asked questions
Plastic enters the food chain when animals eat or ingest contaminated food materials. Plastic debris, whether on land or in the sea, has an adverse impact on all forms of life. Plastic has been found in the guts of marine animals, in drinking water, and in the soil.
Microplastics get into the next level of the food chain when other animals eat contaminated animals. This process is called "trophic transfer". For example, nanoplastics enter insects and then make their way to fish. Eventually, microplastics move all the way up to the top of the food chain.
The impact of ingesting plastics on human health is not yet fully understood. However, studies show that chemicals added during the production of plastics can disrupt the endocrine system and the hormones that regulate growth and development. Chemicals found in plastic have been linked to health problems including cancer, heart disease, and poor foetal development.
