Is Microwaving Plastic Wrap Safe? Insights from Food Scientists
Reviewed by Dietitian Katey Davidson, M.Sc.FN, RD, CPT
Key Highlights
- Using plastic wrap in the microwave can lead to chemical transfer, especially under high heat or when it makes direct contact with food.
- Opt for microwave-safe plastic wrap, ensure there’s ventilation, and avoid letting it touch your food directly.
- For a safer alternative, consider reheating your meals in glass or ceramic containers rather than plastic.
After a hectic day, opening your refrigerator to find a stash of leftovers can feel like hitting the jackpot. Reheating these meals is typically a breeze—but what about keeping that plastic wrap on while doing so? With rising concerns surrounding microplastics and chemical contamination in our foods, it's understandable to have some hesitation. Questions like: "Will the wrap melt?" "Could harmful chemicals seep into my food?" "What could this mean for my hormones and health?" are all valid inquiries. Experts suggest that the answers are not entirely straightforward.
Let’s delve into what food safety experts and scientists have to say about reheating food with plastic wrap, along with some essential tips for doing it safely.
Is It Safe to Use Plastic Wrap in the Microwave?
The United States Department of Agriculture (USDA) states that it is generally safe to use plastic wrap in the microwave, provided it is marked as microwave-safe. It's crucial to ensure that the wrap does not come into direct contact with the food and that it has proper ventilation to allow steam to escape.
"Plastic wrap is crafted to manage the steam produced during microwaving. However, if it makes contact with hot food, it can be exposed to elevated temperatures that increase the likelihood of chemical migration," explains Melissa Vaccaro, M.S. (https://www.linkedin.com/in/melissa-vaccaro/). "If the plastic wrap isn’t designated as microwave-safe, or if it melts or touches hot food, it's best not to use it in the microwave."
There exists a risk that plastic wrap may melt onto your food or release tiny particles and chemicals—a process referred to as migration. Dr. Po-Yen Chen (https://chbe.umd.edu/clark/faculty/1396/PoYen-Chen) notes that this risk is heightened when the wrap comes into contact with food, particularly at higher temperatures, extended heating durations, or with greasy foods, which tend to heat more intensely at the surface. “Microwave hot spots can cause the plastic wrap to soften and distort, increasing its contact with the food and the potential for chemical transfer,” he adds.
While specific research on microwaving food covered with plastic wrap is somewhat limited, studies examining other types of food packaging have indicated that they may contain chemicals linked to hormonal disruption (https://www.eatingwell.com/forever-chemicals-endocrine-disruptors-expert-kitchen-swaps-amazon-11795890) and metabolic issues, such as phthalates. This concern amplifies when these materials are heated to high temperatures during cooking.
Laurie Beyranevand, J.D. (https://www.vermontlaw.edu/faculty/beyranevand-laurie) highlights that contemporary plastic wraps have been free from phthalates for several years; however, they often consist of materials that resemble phthalates chemically and may carry similar health risks.
"Although the levels released during one instance of microwaving are usually considered minimal, heating plastics and allowing them to come into direct contact with food can raise exposure levels," states Chen. "Thus, minimizing unnecessary heat exposure between plastics and food, particularly for routine reheating, is a practical approach to limit avoidable risks."
How to Safely Heat Your Food
- Utilize Glass or Ceramic Storage Containers. Whenever feasible, opt to microwave your food in a glass or ceramic plate, bowl, or container that is labeled microwave-safe (https://www.eatingwell.com/is-it-safe-to-microwave-food-in-plastic-containers-11717095). "Avoid reheating food in the packaging it arrived in or any restaurant leftovers," advises Beyranevand.
- Consider Alternative Food Covers. "Instead of using plastic wrap, cover your food with a microwave-safe lid, paper towel, or wax paper," suggests Vaccaro.
- Ensure Plastic Wrap Is Microwave-Safe. If you choose to use plastic wrap, confirm that it is specifically designated as microwave-safe and ensure that it does not touch the food. "While plastic wrap can endure steam heat, it is not designed to withstand the higher temperatures that occur when it directly contacts hot food," Vaccaro emphasizes.
Our Expert Opinion
Heating food covered with plastic wrap can be safe—provided that the wrap is microwave-safe, adequately vented, and does not contact the food directly. However, if these conditions are not met, there is a risk of melting or chemical transfer. It's worth noting that this risk escalates with high heat or prolonged cooking times, but is relatively low for brief reheats of about 30 seconds.
For peace of mind, consider bypassing the plastic wrap altogether and use a microwave-safe glass or ceramic storage container, plate, or bowl instead.
For more detailed information, check out the original article on EatingWell (https://www.eatingwell.com/is-it-safe-to-microwave-plastic-wrap-11888933).
So, what do you think? Are you comfortable using plastic wrap in the microwave, or do you prefer safer alternatives? Join the conversation and share your thoughts!
