1. Meat: Try to choose beef, mutton and chicken with less unsaturated fatty acids. Pork is rich in unsaturated fatty acids and is not suitable for box lunch. Don't pack seafood in box lunch, or you may be poisoned.

2, vegetables: green leafy vegetables are not suitable, nutrition, dishes will be greatly reduced; Eggplant vegetables are not easy to deteriorate, and it is not easy to change the color and flavor of vegetables after microwave heating. Cold dishes are not suitable for long-term storage, nor for box lunch.

3, staple food: rice is the best, steamed bread is easy to dry.

In addition, the lunch box must be suitable for microwave heating.