Is microwaving food safe, and does it preserve nutrients?
Quick answer
A properly functioning microwave used as directed does not make food radioactive. Nutrient changes depend on heat, water and time across cooking methods. Use suitable containers and heat food evenly so that cold spots do not allow harmful microbes to survive.
Details
Safer reheating steps
- Follow package instructions and oven wattage, using microwave-safe cookware.
- Stir or turn food where possible and allow the specified standing time.
- Check several areas with an appropriate food thermometer; reheat leftovers to 74°C.
Prevent burns and container problems
Open lids away from your face to avoid steam. Do not heat food in unsuitable disposable containers or use an oven with a damaged door or latch. Food colour or a hot plate does not prove the centre has reached a safe temperature.
Do not microwave an infant’s milk: uneven heating can create scalding hot spots even when the container feels lukewarm.
Related reading: Are frozen fruits less nutritious than fresh fruit, and are they safe?.
Note: This answer is for educational purposes and does not replace a consultation with a specialist who examines your case in person. Do not use it for self-diagnosis.