Ordinary plastic lunch boxes have poor heat resistance and cannot be used as cookware in microwave ovens.

2. Glass bowls with poor heat resistance

When cooking food with oil, the temperature may be very high and it is easy to break the glass lunch box, so you can't use a glass lunch box that is not heat-resistant.

3. Microwave cannot penetrate the metal bowl.

Aluminum pot, enamel pot, stainless steel pot and other metal lunch boxes can't be penetrated by microwaves, and the metal will collide with the inner wall of the furnace and can't be used.

4, lacquer bowl

The paint on the painter's lunch box may peel off and melt after heating, resulting in harmful substances, and the container may also crack. The heated food is not good for the health.

Extended data

Eating too much food heated by microwave oven may cause cancer.

Experts point out that many plastic containers of microwave food contain carcinogenic poisons, which will enter the human body with food, causing extra pressure on the digestive system and immune system, and even adversely affecting fertility, hormonal balance, blood pressure, cardiovascular health and mood. The extra radiation from the microwave oven may also affect people's sleep quality, attention and physical strength.

Nutritionists point out that the nutritional value of microwave food is low, and the fruits and vegetables contained in it may lose half of vitamin C during pre-cooking. In order to prolong the shelf life and increase the flavor, microwave food will add a lot of unhealthy additives such as salt, sugar, saturated fat and preservatives. The nutritionist said: "Microwave food rarely contains organic food, and most of them are cheap and lack nutrition."

Refer to People's Daily Online-The microwave oven "bites rice" to be careful of causing cancer. Four types of lunch boxes should not be put into the microwave oven.