You can do this from the perspective of ecological balance. Not eating meat will lead to a large number of animals breeding wantonly, and human veganism will also cause the food of many animals to be plundered, putting humans and animals in a competitive relationship in the food web. And from a nutritional point of view, a pure vegetarian diet is far from enough for people, especially teenagers in the developmental period. . . (My humble opinion, don’t comment if you don’t like it)