Teaching by example speaks louder than words, eating leftovers in the trash can face to face, with good intentions. However, eating leftovers in public to oppose waste and advocate frugality will inevitably cause some doubts. I think it's better to work hard at ordinary times to improve the catering service level in canteens, such as "half bowl of rice", "half dish", "weighing dishes" and "prize-winning CDs", which have been proved to be effective and can be replicated and popularized.

Parents take this way to educate their children when their children waste food. Although it can shock children's hearts to a certain extent and make them feel guilty about their food waste, parents' avoidance is also somewhat exaggerated. After all, children nowadays are more sensible in most cases. Parents can explain to their children the importance of cherishing food, point out the mistakes of their children's food-wasting behavior, and also achieve the goal of educating their children.

The reasons why children waste food are complicated and need specific analysis, which cannot be simply attributed to children's ignorance of saving. If the child is full, or the food is not to the taste, it is harmful to the child's physical and mental health to force the child to finish Chinese food by setting an example.

In fact, the effect of eating leftovers in the trash can in public is not as remarkable as expected. Similar practices have existed for a long time, but most of them have disappeared and have never been effective empirical practices.