The first is to make more acidic dishes, because more acid makes bacteria multiply slower.
The second is to choose ingredients suitable for multiple heating dishes, such as potatoes, carrots, beans, eggplant, tomatoes, winter melon, pumpkin, radish, mushrooms, seaweed, fungus and so on. If you use green peppers, they are hard to eat after repeated reheating. If you use spinach, it tastes bad when it's too soft and turns a dark olive green color.
If you want to supplement the green leafy vegetables, but are not afraid of the color brown, you can blanch it in boiling water in advance. This removes over 70% of the nitrates and nitrites. Since the nitrates are already very small, they will not turn into nitrites in the refrigerator storage process, and it is "safe" to bring them in the lunch box and reheat them. If you don't like the dark color, wait until you get home for dinner and add more leafy greens.
Third, if you're making raw coleslaw, consider adding more vinegar, ginger, and garlic paste for a full bacterial inhibition that's much safer. You can also put directly wash raw vegetables, and then bring some fried sauce, sweet noodle sauce, soybean paste and so on, directly dipped in food, refreshing and delicious, and safer.
In this way, with three boxes to the unit, there is rice, and hot dishes, and raw vegetables or fruit, basically to meet the nutritional needs. If the unit has a refrigerator, it is really good, only a little time on the road, the risk of bacterial reproduction will be much smaller, food varieties and cooking methods do not need to be so strict. Despite the fact that you have to reheat the food after taking it, there is inevitably a certain loss of nutrients, but after all, food safety is the first priority, so don't try to save money when it comes to heating.
Many plastic lunch boxes on the market can not meet the quality requirements, after heating the odor, and even contain plasticizers, such a box can not be used. To see that it is PP (polypropylene) material, or show that can be used repeatedly and used to do microwave heating can be used. There is a back wall of the sealing jar, neither deformation, nor flavor, but also to achieve the sealing effect, used to bring rice is ideal, or stainless steel sealed lunch box is also very good.