Animals are not food, they are living beings with consciousness, preferences, and feelings. They will do literally anything to escape being killed, imprisoned, etc.
Plants on the other hand are usually not killed to eat (the biggest exception being certain root vegetables), and in general we eat the parts that are designed to be eaten to spread the seeds (fruits/flowers), and parts that will simply wither off and die on their own (leaves).
The biggest shift is in the viewing of and relationship to these living things. Am I just stumbling around tearing up plants to eat, or am I present, seeing what is ready to be eaten, and showing my gratitude for the plant.