Explanation:

The electric lunch box is not suitable for the refrigerator. Electric lunch boxes belong to small household appliances and can be directly plugged in. It is most afraid of getting wet. The environment inside the refrigerator is humid, so using the electric lunch box will cause short circuit and scald. It is recommended that you wrap it in a fresh-keeping box or other containers and store it in the refrigerator. It is safe and reliable.

It depends on the material of your lunch box. For example, aluminum and lead are harmful, and stainless steel is basically harmless, but if you put sour and vinegar food, it may be harmful. It's best not to put it like this. It's best to put the food on the plate.

The solution is:

Is to buy a high-grade ice pack, generally tens or hundreds of pieces, but as long as the thermal insulation performance is better, the investment is still worthwhile. Then the night before, put the vegetables and rice in ordinary sealed lunch boxes and put them in the refrigerator for refrigeration. No green leafy vegetables. You can't eat green leafy vegetables every other meal, which will cause cancer. Specifically, you can search the menu of bringing meals to work and school and do it accordingly. It is best to put several insulation bricks in the insulation bag at the same time (also put them in the freezer drawer in advance to keep the temperature low)