Is Your Office Microwave Making You Sick?

The office microwave – a convenient and essential tool in almost every workplace – can pose a serious health risk if not properly maintained. Though it may seem like a harmless appliance, it can easily become a breeding ground for bacteria, especially after 2:00 p.m., when food residue tends to accumulate.

Recent studies have found that microwaves, particularly in office settings, can harbor harmful bacteria like Staphylococcus, Salmonella, and E. coli, which can lead to unpleasant illnesses. Although microwaves are intended to kill bacteria through heat, uneven heating – a common issue with these appliances – may leave cold spots in food that allow bacteria to survive.

Dr. Charles Gerba, a virology professor at the University of Arizona, explained, “The office microwave can be a major transmission point for bacteria, much like the kitchen area itself.” He added that, in many cases, the office break room contains more bacteria than the restroom.

If you're using a microwave at work, these are a few tips for safe use:

• Avoid reheating food after 2:00 p.m. – Try eating earlier in the day or bringing snacks that don’t require heating.

• Cover your food – Use a lid or a paper towel to prevent bacterial spread.

• Stir halfway through – This helps eliminate cold spots and ensures even heating.

• Check temperature – Make sure food reaches at least 75°C (167°F) throughout. Use a food thermometer if possible.

Three more essential tips:

1. Clean the microwave regularly – Wipe and sanitize the inside often to prevent bacteria buildup.

2. Avoid high-risk foods – Items like eggs require extra care when microwaving.

3. Encourage cleanliness – A friendly reminder on the office noticeboard can go a long way in keeping the shared space sanitary.

By following these simple precautions, you can reduce the risk of illness and keep your lunch – and your coworkers – safe.