The microwave is a handy kitchen tool, but it’s not suitable for everything. Some foods and objects can pose serious health and safety risks when microwaved – from contamination to fire hazards. Here are 10 things you should never put in your microwave, and why.
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Foods
1. Eggs in their shell
Microwaving whole eggs can cause them to explode. Steam builds up inside the shell as the egg heats, and without an escape route, it bursts – leaving a mess and potentially causing burns.
2. Frozen meat (when still solid)
Microwaving solid frozen meat can lead to uneven heating. The outer layer may cook while the inside remains frozen, allowing harmful bacteria to survive and multiply.
3. Processed meats
Microwaving processed meats like sausages or deli slices can result in chemical changes. Preservatives and additives may react with the heat to form harmful compounds, such as nitrosamines.
4. Breast milk or baby formula
Heating breast milk or formula in the microwave can create uneven hot spots, which may scald a baby’s mouth. It can also break down some of the milk’s nutrients. Use a warm water bath instead.
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Objects
5. Aluminium foil
Microwaves reflect off foil, causing sparks that can lead to a fire or damage the appliance. Never use foil to wrap or cover food in the microwave.
6. Takeaway containers with metal linings
Some takeaway boxes include metal elements or foil linings. These can ignite or spark, posing a fire hazard. Always transfer food to a microwave-safe dish first.
7. Travel mugs (if metal)
Metal travel mugs block microwaves from heating your drink and can damage the appliance. Even ceramic mugs with metallic paint or trim should be avoided.
8. Plastic containers not labelled microwave-safe
Some plastics release harmful chemicals, like BPA or phthalates, when heated. These can leach into your food. Use only containers labelled “microwave-safe.”
9. Paper bags
Plain paper bags can catch fire in the microwave. They’re also not food-safe, as they may release toxins when heated. Use microwave-safe paper towels or parchment paper instead.
10. Styrofoam containers
Styrofoam, a type of polystyrene foam, can melt in the microwave and release harmful chemicals into your food. It also poses a fire risk. Always transfer food into a ceramic or glass container.
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