To exist is to inflict death and suffering
When we exist we generally kill other beings such as fish, poultry, livestock in order to eat. Even taking the life of a variety of plants is killing its being in order to sustain ourselves.
Only a small portion of food such as vegetables (tomatoes, potatoes), fruit (apples, banana's,..) and nuts are the byproduct of a living plant or tree that doesn't need you to kill the plant. But in broad terms and also in wildlife, there is killing in order to survive. Even the gazelle eating plants is taking the life from those plants in order to sustain itself.