Lead by example.
Instead of just verbally educating children, it is better to set an example and set a good example for children. When you personally demonstrate how to cherish food and not waste food, children will pay more attention to this point, and they will feel that their instructors are doing this and they should follow suit.
Cherish food and don't waste it.
Start with dolls and teach children to cherish food and not waste it. Take as much as you eat, don't be greedy. In this way, children will not only remember, but also put them into action every time.
Cultivate good habits and benefit for life.
Cultivate such good habits from an early age, and children will keep them when they grow up. In this way, they can become good teenagers with good quality.