Sofia Martinez
Plastic is known to contain a variety of chemicals, some of which can act as endocrine-disrupting chemicals (EDCs) that interfere with the endocrine (hormone) system. Studies have shown that heating plastic, especially with fat, can cause these chemicals to leach into food or drinks. One of the most well-known EDCs found in plastic is Bisphenol A (BPA), which can mimic the sex hormone estrogen and has been linked to various health issues, including fertility problems and developmental abnormalities. Other EDCs such as phthalates and heavy metals have also been identified in plastic, contributing to hormonal imbalances and potential endocrine abnormalities. While regulatory agencies are working towards addressing this issue, individual actions such as avoiding heating plastic and reducing plastic exposure can help minimize potential health risks associated with these hormone-like chemicals.
| Characteristics | Values |
|---|---|
| Types of chemicals released | Estrogen-like chemicals, Endocrine-disrupting chemicals (EDCs), Bisphenol A (BPA), phthalates, heavy metals |
| Effects on the body | Interferes with the endocrine system, hormone imbalance, PMS, period pain, fertility issues, developmental issues, increased risk of certain cancers |
| Products containing these chemicals | Plastic bottles, baby bottles, food wraps, deli packaging, flexible bags, disposable diapers, polystyrene foam |
| Recommendations | Avoid heating plastic, avoid plastic food packaging, wash hands regularly |
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What You'll Learn
Endocrine-disrupting chemicals (EDCs)
EDCs can act as "hormone mimics", tricking the body into thinking they are hormones. They can also block natural hormones from doing their job, or increase/decrease the levels of hormones in the blood by affecting how they are made, broken down, or stored in the body.
EDCs have been linked to numerous adverse health outcomes, including alterations in sperm quality and fertility, abnormalities in sex organs, endometriosis, early puberty, altered nervous system function, immune function, certain cancers, respiratory problems, metabolic issues, diabetes, obesity, cardiovascular problems, growth abnormalities, neurological and learning disabilities, and more.
One example of an EDC is Bisphenol A (BPA), a chemical used to make polycarbonate plastics and epoxy resins. BPA is often used in manufacturing, food packaging, toys, and other applications. Another example is phthalates, which are found in some plastics and have been linked to fertility problems in both male and female workers in the plastic industry.
While EDCs cannot be completely avoided, people can make informed choices to reduce their exposure and potential health risks. For example, individuals are advised to avoid heating food in plastic containers, as this increases chemical leaching.
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Xenoestrogens
A study published in Environmental Health Perspectives found that more than 70% of plastic products release chemicals that act like oestrogen. This includes products that do not contain BPA (bisphenol A), a well-known xenoestrogen. When plastic is heated or exposed to sunlight, it can accelerate the release of these chemicals, which can then leach into food or drink.
The presence of xenoestrogens in the body can disrupt the delicate balance of natural hormones. In women, this can lead to symptoms such as heavier and more painful periods, PMS, mood swings, anger, irritability, painful breasts, bloating, and headaches. Xenoestrogens can also contribute to oestrogen dominance, which is associated with an increased risk of fertility problems and ovarian cysts.
In addition to BPA, other xenoestrogens found in plastics include phthalates and PCBs. These chemicals are used as plasticizers and additives to improve the flexibility and durability of plastic products. However, their endocrine-disrupting properties have raised concerns about their impact on human health. Some studies have linked phthalate exposure to an increased likelihood of preterm birth and disruptions in insulin function, leading to diabetes.
The release of xenoestrogens from plastics is a significant health concern. Regulatory agencies and international treaties are working towards stricter testing and regulation of plastic chemicals to address this issue. In the meantime, individuals can take steps to minimise their exposure to plastic, such as avoiding heating food in plastic containers and choosing glass or metal alternatives whenever possible.
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BPA and phthalates
Bisphenol-A (BPA) and phthalates are ubiquitous chemicals used in making countless plastic products. BPA is used in hard, clear plastics, like baby bottles, while phthalates make plastic flexible and are found in items like pacifiers. These chemicals are so common that they are referred to as "everywhere chemicals".
The impact of BPA and phthalates on human health is still being studied, and the results are inconclusive. However, there is growing evidence that these chemicals may have similar effects on humans, including fertility problems and disruptions to insulin function. The tendency of these chemicals to migrate out of plastics and into the environment was first observed in the 1970s for phthalates and in the 1990s for BPA.
To minimize exposure to BPA and phthalates, it is recommended to avoid heating food in plastic containers, as this increases chemical leaching. People are also advised to avoid plastic containers marked with a 1 or 7, as these are more likely to contain BPA or phthalates. Glass, porcelain, and stainless-steel containers are suggested for food and beverages, especially when dealing with hot items.
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Health problems caused by hormone disruption
Plastic products, from baby bottles to food wraps, can release endocrine-disrupting chemicals (EDCs) when heated. These chemicals can act like the sex hormone estrogen, even if the plastic is BPA-free. BPA is a compound in certain plastics that has been widely criticized for mimicking estrogen.
EDCs can have various adverse effects on human health, including:
- Fertility problems: Research has shown that exposure to phthalates, chemicals found in some plastics, during pregnancy can lead to lower levels of male sex hormones in utero, resulting in a shorter distance between the anus and genitals (anogenital distance or AGD) in male offspring. This has also been observed in pregnant people, with higher phthalate levels in urine associated with shorter AGD in sons. Men with a decreased AGD have been found to have a lower sperm count. Additionally, studies on rats have shown that exposure to BPA during pregnancy can result in reduced fertility and the development of ovarian cysts in female offspring.
- Endocrine Disorders: EDCs can induce various endocrine disorders such as infertility, precocious puberty, hormone-based tumors, metabolic problems, disruption of granulosa cell steroidogenesis, and polycystic ovary syndrome (PCOS).
- Neurodevelopmental abnormalities: EDCs can transfer from pregnant women to the fetal bloodstream, causing neurodevelopmental abnormalities in infants. Animal studies have also shown that EDCs can cause DNA modifications with repercussions across multiple generations.
- Diabetes: Observational studies have linked phthalate exposure to disruptions in insulin function, implicating these chemicals in diabetes.
- Cancer: EDCs have been linked to hormone-related cancers.
- Disruption of thyroid function: Long-term exposure to plastic particles and associated chemicals has been shown to exhaust thyroid endocrine function by weakening its driving forces in regulating growth, development, metabolism, and reproduction. Chemicals like PBDEs, phthalates, and organotins act as thyroid-disrupting chemicals (TDCs) and can cause thyroid dysfunction and developmental abnormalities.
- Other developmental abnormalities: Exposure to flame retardants, which contain phthalates, has been associated with a reduced IQ in children.
While most studies of the health effects of EDCs have been conducted on animals and lab-grown cells, the evidence suggests that these chemicals can have detrimental effects on human health, particularly the endocrine system. Regulatory agencies and international cooperation are needed to address this issue and implement necessary changes. In the meantime, individuals can take small steps to minimize their exposure to EDCs, such as avoiding heating food in plastic and reducing the use of plastic products.
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Plastic alternatives
Many plastic products, including those marketed as BPA-free, can release chemicals that act like the sex hormone estrogen when heated. This has raised concerns about the potential health impact of plastics, especially those that come into contact with food. To address these concerns and the broader plastic crisis, scientists and companies are developing sustainable alternatives to plastic that are safer for the environment and human health.
One alternative is biodegradable algae-based packaging. For example, the Norwegian startup B'zeos uses seaweed to create sustainable and edible products such as drinking straws, condiment packets, cutlery, and plastic wrap. Another leader in this space is Notpla, the 2022 Earthshot winner, which produces seaweed-based cutlery and compostable takeout containers. While these alternatives show promise, they face challenges in terms of scaling up production and optimising costs.
Another bio-based and biodegradable plastic alternative is PHA (polyhydroxyalkanoates). PHA is produced by microorganisms through bacterial fermentation fueled by plant sources, food waste, and agricultural waste. It degrades faster than other bioplastics like PLA (polylactic acid) and is relatively easy to compost at home. Companies like Genecis and Refork are utilising PHA in the production of eco-friendly cutlery, straws, and toothbrushes.
Silicone is another alternative to plastic that is considered much safer and more environmentally friendly. It shares many physical characteristics with fossil fuel-derived plastics but does not leach toxic residues or microplastics. Platinum silicone, in particular, is considered one of the safest forms and is used in kitchen products and medical implants. However, silicone products are not widely accepted for recycling, and the process of recycling them is not available at every facility.
In addition to these alternatives, researchers are exploring innovative solutions like a biodegradable and antimicrobial spray-on coating made from plant cellulose for produce and food items. This coating can be easily rinsed off with water and is designed to degrade in soil within 3 days, eliminating the need for plastic packaging. Other natural fibres such as coconut fibre, hemp, husk, and cotton burs are also being considered as alternative packaging and shipping materials.
While these alternatives show promise, it is important to recognise that simply replacing disposable plastic with another material may not be a comprehensive solution. A more holistic approach involves reducing our dependence on single-use plastic and adopting reusable and refillable packaging options, which can have a significantly lower environmental impact.
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Frequently asked questions
Heated plastics do not directly secrete hormones, but they do release endocrine-disrupting chemicals (EDCs) that can interfere with the body's hormonal systems. These EDCs can act like the hormone estrogen, causing an excess of estrogen in the body, known as estrogen dominance.
The release of EDCs from heated plastics has been linked to various health issues, including fertility problems, PMS, period pain, and disruptions to insulin function.
To minimize exposure to EDCs from plastics, it is recommended to avoid heating food in plastic, using plastic containers in the microwave or dishwasher, and storing food in plastic. Instead, use glass or ceramic containers for heating and storing food.
Some companies, like PlastiPure, manufacture water bottles that they claim are free of estrogenic chemicals. However, it is important to note that even plastics marketed as BPA-free may still release EDCs.
There is a growing recognition of the need for regulation and systemic change to address the issue of EDCs in plastics. Efforts are being made to negotiate a global plastic treaty to bring international regulation and shine a spotlight on plastic chemicals.
