Moral reasons. All else equal, I think that inflicting pain or death is bad, and that the ability to feel pain and the desire to not die is very widespread. I also think that the intensity of pain in simpler animals is still very strong (I think humans did not evolve large brains because otherwise the pain was not strong enough). I also think that our ability to manage pain slighly reduces the impact of our having the ability to suffer more strongly and with more variety. But I give, for sanity check reasons, priority to the desires of "more complex" animals, like humans. Due to our technical ability we can now produce supplements for micronutrient which are missing or insufficently available in plants[1], and so I see health concerns resolved. So all the pain and death that I would inflict would only be there for greated enjoyment of food. Although I love the taste of meat and animal products, the comparative enjoyment is not big enough that I would kill for it. That I can enjoy plant-based foods is partly based upon my not being afraid of using my kitchen, and having a good vegan/vegetarian self-service restaurant 100m from my apartment. And than there are the environmental reasons, and the antibiotic use, etc. etc. They count, and might be even sufficent on their own, but I'll only investigate those in case my other concerns/reasons were invalidated. [1] There is vegan vit B12, vit D3, EPA/DHA (omega3), and creatin powder.