Usually, manufacturers will use some chemicals in insulated lunch boxes, some of which will enter food at high temperature for a long time, which is harmful to health.

Ways to bring food to work in summer without spoiling;

First, buy a high-grade ice pack, which usually costs dozens 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).

If you don't want to use one method or it's inconvenient, you can use an insulated lunch box. The same night before, put rice and vegetables in the inner container of the insulated lunch box, put the inner container in the freezer drawer of the refrigerator, and dry the outside of the inner container, otherwise it will freeze and stick to the drawer. The next morning, put the frozen rice and vegetable liner into an insulated lunch box, seal it, and preferably wrap it in an insulated coat. After half a day, it is estimated that it has not completely melted, and it can be eaten after being heated in the microwave oven at noon. Hot dishes and hot meals should be eaten within 2 ~ 3 hours, or stored in cold storage at low temperature (below 4 degrees Celsius). Refrigerated meals should be thoroughly heated to 100℃ before they can be eaten (thorough heating kills all possible bacteria). If it lasts for more than 3 hours at room temperature, bacteria will multiply in large numbers, leading to food poisoning symptoms such as vomiting and diarrhea after eating.