generally speaking, as long as you can keep it, it won't make you search if you use an insulated lunch box to bring food in summer. It's best to cook the food now in the morning to prevent it from going bad. It's best to prepare the food in the morning and take it to the office. Don't bring insulated food. If you bring vegetables, just fry them until they are 7% to 8% ripe, so as not to destroy the nutrients when heating. In addition, the cooked food should be put into the lunch box after the temperature drops.