Maya Ellison
The use of plastic containers in microwaves has become a common practice, especially for heating up leftovers or baby food. However, there are growing concerns about the safety of microwaving plastic. Studies have shown that microwaving plastic can cause the release of millions to billions of microplastics and nanoplastics, which can end up in our food. These plastic particles have been linked to potential health risks, including hormone disruptions and more. While some plastics are labelled microwave-safe, this term refers to the plastic's ability to withstand heat without melting, not its chemical safety. The FDA relies on limited self-reported data from manufacturers to approve plastic products for food contact, and the health effects of consuming microplastics and nanoplastics are still not fully understood. As a result, there are calls for further research and independent testing to ensure the safety of plastics used in microwaves.
| Characteristics | Values |
|---|---|
| Plastic type | Polypropylene (PP), Polystyrene (PS), Polycarbonate, Polylactide, Acrylic, Acrylonitrile Butadiene, Styrene, Fiberglass, Nylon |
| Plastic properties | Tough, moldable, heat-resistant, lightweight, flexible, durable |
| Plastic additives | Bisphenol A (BPA), Phthalates |
| Plastic use | Food storage containers, beverage containers, dishes, medical devices, automotive parts, baby bottles, toys |
| Plastic concerns | Leaching of chemicals into food, release of microplastics and nanoplastics, potential health risks |
| Safe alternatives | Glass, stainless steel, ceramic, porcelain |
| Recommendations | Avoid plastics with numbers 1, 3, 6, or 7; choose BPA-free and phthalate-free products; follow USDA guidelines for microwave-safe plastics |
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What You'll Learn
- Microwaving plastic containers can release harmful chemicals into food
- Polypropylene is considered safe for food contact, even in the microwave
- Microwaving plastic containers can release billions of microplastics and nanoplastics
- Phthalates and Bisphenol A (BPA) are harmful chemicals added to plastics
- Plastic containers marked with a 1 or 6 should be avoided for microwaving
Microwaving plastic containers can release harmful chemicals into food
A 2021 study by the University of Nebraska-Lincoln found that microwaving plastic baby food containers available on U.S. shelves released billions of plastic particles, including more than 2 billion nanoplastics and 4 million microplastics per square centimeter of the container. Another study by Hussain and his colleagues at the same university found that when certain baby food containers were microwaved, they released millions of bits of plastic, called microplastics, and even smaller nanoplastics. These particles were also found in significant quantities in refrigerated and room-temperature food and drink stored in plastic containers over a six-month period.
The health effects of consuming micro- and nanoplastics are still unclear, but researchers suspect they are harmful. Three-quarters of cultured embryonic kidney cells died after being introduced to these particles, and a 2022 World Health Organization report recommended limiting exposure to them.
To avoid exposure to harmful chemicals, it is recommended to opt for reusable glass, ceramic, stainless steel, or microwave-safe porcelain containers instead of plastic.
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Polypropylene is considered safe for food contact, even in the microwave
Microwaving food in plastic containers is associated with increased leaching, which is the transfer or leaking of chemicals into food. The two key culprits to dangerous plastics are the man-made chemicals phthalates and Bisphenol A (BPA), which are added to plastics to help them keep their shape and pliability. In high volumes, these chemicals have been linked to several negative health outcomes, including hormone disruption, respiratory issues, and cardiovascular diseases.
Polypropylene is ranked at 5 and is considered safe for food storage. It is FDA-approved for food contact and has a high heat tolerance, which means it won't leak toxins when breaking down. It is known to be a safer alternative to most other plastics and can be used to heat beverages or foods without leaching. Polypropylene food-safe containers include medication bottles, dairy containers, and food storage boxes.
However, it is important to note that not all plastics are created equal, and some plastic formulations are better suited for heating food in the microwave than others. While polypropylene is considered safe for microwave use, it is always a good idea to follow USDA guidelines and only use clearly indicated "microwave-safe" plastic containers. Additionally, individuals can opt for reusable glass, stainless steel, or ceramic containers to avoid the potential risks associated with microwaving plastic.
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Microwaving plastic containers can release billions of microplastics and nanoplastics
Microwaving plastic containers is linked to increased leaching, which refers to the transfer or leaking of chemicals into food. While the FDA has approved certain plastics, like polypropylene, as safe for food contact and microwave use, some experts disagree and believe there is enough evidence to show that "microwave-safe plastic" is not truly safe.
A study from the University of Nebraska-Lincoln found that microwaving plastic baby food containers available in U.S. stores can release a significant number of plastic particles. In some cases, containers released more than 2 billion nanoplastics and 4 million microplastics for every square centimeter of the container. The study also found that three-quarters of cultured embryonic kidney cells died after being exposed to these particles for two days.
The two key chemicals of concern in plastics are Phthalates and Bisphenol A (BPA). These substances are known as endocrine disruptors and have been linked to various negative health outcomes, including hormone disruptions, respiratory issues, and cardiovascular diseases. Exposing plastics to heat, such as microwaving, can increase the risk of transferring these chemicals to food.
To reduce exposure to potentially harmful chemicals, it is recommended to avoid microwaving food in plastic containers. Instead, opt for microwave-safe alternatives such as glass, ceramic, or stainless steel containers. Additionally, choose phthalate-free and BPA-free products and pay attention to recycling symbols on plastic containers, avoiding those marked with numbers 1, 3, 6, or 7.
While the health effects of consuming microplastics and nanoplastics are still being studied, it is important to be aware of the potential risks associated with microwaving plastic containers and take steps to minimize exposure to harmful chemicals.
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Phthalates and Bisphenol A (BPA) are harmful chemicals added to plastics
Microwaving plastic containers can release millions of polymer bits, called microplastics and nanoplastics, into food and beverages. While microwaving is generally considered safe, heating food in plastic containers is associated with increased leaching, which is the transfer or leaking of chemicals into the food.
BPA is produced in large quantities and used primarily in the production of polycarbonate plastics and epoxy resins. It is found in various products, including shatterproof windows, eyewear, water bottles, and epoxy resins that coat some metal food cans, bottle tops, and water supply pipes. The primary source of exposure to BPA for most people is through their diet, with BPA leaching into food from the protective internal epoxy resin coatings of canned foods and consumer products such as polycarbonate tableware, food storage containers, water bottles, and baby bottles.
To reduce exposure to these harmful chemicals, it is recommended to avoid heating food in plastic containers, opting instead for glass, porcelain, stainless steel, ceramic, or microwave-safe containers. It is also important to check the recycling symbol on plastic products, with safer options labelled 2, 4, and 5, and to be avoided options labelled 1, 3, 6, or 7.
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Plastic containers marked with a 1 or 6 should be avoided for microwaving
Microwaving food is generally considered safe, but heating food in plastic containers is associated with increased leaching—the transfer or leaking of chemicals into food. The two key culprits are the man-made chemicals phthalates and Bisphenol A (BPA), which are added to plastics to help them keep their shape and pliability. These chemicals are endocrine disruptors, which can mimic or block natural hormones in the body. Exposure to them has been linked to hormone disruptions, respiratory issues, and cardiovascular diseases.
Some plastic containers are safe for use in the microwave, but it is recommended to avoid single-use plastics like those used for yogurt, cottage cheese, and other foods. Plastic containers meant for longer-term use, such as Tupperware, are generally best for microwave use. However, it is important to check the recycling symbol on the bottom and avoid plastics with the numbers 1, 3, 6, or 7. Safer options will be labelled 2, 4, and 5.
Even if a plastic container is labelled "microwave-safe", it simply means it won't melt. Therefore, it is recommended to opt for reusable glass, stainless steel, ceramic, or microwave-safe porcelain instead.
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Frequently asked questions
Microwaving plastic can cause it to degrade, melt, or release chemicals that can be harmful to health.
Plastic containers with the recycling symbols 1, 3, 6 or 7 should be avoided. These plastics may contain harmful chemicals such as BPA and phthalates, which can leach into food when heated.
Plastic containers with the recycling symbols 2, 4 and 5 are considered safer options. Look for containers labelled "microwave-safe", which indicates they won't melt or crack when heated. However, it's important to note that "microwave-safe" does not guarantee the absence of chemical leaching.
It is recommended to use glass, ceramic, stainless steel, or microwave-safe porcelain containers instead of plastic. Transfer food to these containers before microwaving to reduce the risk of exposure to harmful chemicals.
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