Brother talks about Buddhism and science based on the theory of evolution, with preconceptions and leading questions, and it seems that he cannot get objective answers.

First of all, people can live without eating meat and their health will not be affected. Meat is not a necessity for human survival. We eat meat because we have been eating it since we were children, and people around us also eat it. This is a matter of living habits, and it is not a matter of evolution. If a person has grown up eating food, the smell of meat will make him feel sick. Even if you have eaten meat for a long time and been a vegetarian for a while, you will still feel nauseous if you smell the smell of meat. This is a common experience of many vegetarians. On the contrary, those who have eaten meat for a long time will not feel sick no matter how much they eat. This is the case for many people in Tibet and Xinjiang. This shows that meat is not really suitable food for humans to eat. Scientific research shows that humans do not have the characteristics of carnivores, from their tooth structure to their digestive system. The above is science.

The higher level is from the perspective of Buddhism. All living beings have egos and strong attachments to their bodies. Having your body killed or eaten will cause great resentment in your spiritual consciousness. This resentment leaves a seed in Alaya consciousness and never dies. When the conditions are ripe, this resentment will be brought up again to take revenge on those who killed me and ate me. Struggles, killings, and wars in the world are all manifestations of the mature killing karma over countless kalpas, and are not accidental. There is a saying in Buddhism: If you want to know the tribulations of swords and weapons in the world, just listen to the sound of the slaughterhouse in the middle of the night. Swordsmanship is war. Therefore, killing and eating meat creates a cycle of cause and effect, causing all living beings to reincarnate and kill each other, causing endless suffering. Today I eat you, tomorrow you eat me. The Buddha is a person who has realized the truth and saw the truth, so he advised us not to kill and eat meat.

I hope it will be helpful to my brother and wish you good luck