Those who exclusively eat plant products without animal products at all.

For those who choose to be vegan for ethical reasons. I salute them. For your information, a vegan diet can save a lot of land for use as a food industry. Reducing the production of greenhouse gases from animal waste. And yes, animal deaths also decrease if there are many vegans.

Animals need to eat so they can grow and take their meat. The land and costs used to grow livestock food can be allocated to be used directly into human food so that more food for everyone.

Although of course if it were the whole vegan world. Farm animals may become extinct because they cannot survive in the wild or are threatened with extinction. The best way for animals other than humans to be sustainable and to have a large population is to be able to be cultivated by humans.

But if the vegan argument is for general health reasons, so to claim that vegans are healthier than omnivores. Of course they are wrong.

Not all animal products are certainly because you can't possibly be healthy with one kilogram of bacon every week rather than one kilogram of kale. But lean meat that is processed without using a lot of salt and oil along with various vegetables and fruits is arguably healthier than a diet that contains only green vegetables and fruit. Because of the lack of protein and healthy fats.