I am a vegetarian, and have been one for four decades, because I wish to cause as little suffering as possible to my fellow living beings. I do not think it is up to me to judge which beings have more right to life. Vegetarianism has not had a negative effect on my health. I am in my sixties and probably more healthy than most women my age. I am very physically active. My diet consists primarily of fruits, vegetables, nuts and grains, prepared as simply as possible. I do not kill anything. I do remove insects from my home, but I do not kill them. I have never understood why people need to discuss this. It is better for the environment and, I believe, better for one's health, and certainly better for the animals that would have been slaughtered. I cannot see a down side to being vegetarian. Yes, many of my friends criticize me for what they see as my extreme food choices, but that is their problem, not mine. I choose to see all my fellow creatures as valuable and worthy of respect and kindness. It is so simple and basic. If something causes pain and suffering to other living things, don't do it.
Just my humble opinion.