Before the flood man did not eat meat.
29 Then God said, "I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food. 30 And to all the beasts of the earth and all the birds of the air and all the creatures that move on the ground-everything that has the breath of life in it-I give every green plant for food." And it was so.
After the flood man began to eat meat.
2 The fear and dread of you will fall upon all the beasts of the earth and all the birds of the air, upon every creature that moves along the ground, and upon all the fish of the sea; they are given into your hands. 3 Everything that lives and moves will be food for you. Just as I gave you the green plants, I now give you everything.