Green plants are food for every creature in Eden including men. Gen 1:29-30; "God said, “see, Igive you every seed bearing plant that is upon all the earth, and every tree that has seed bearing fruit; they shall be yours for food.and to all the animals on land, to all the birds of the sky, and to everything that creeps on earth, in which there is the breath of life, I give all the green plants for food.”
Adam was famer not hunter.Gen.2:15 “The Lord God took the man and placed him in the Garden of Eden, to till and tend it.”
After the Fall Gen 3:18 “thorns and thistles shall it sprout for you.But your food shall be the grasses of the field.” Again no meat.
Mankind was, in the biblical view vegetarian until after the Flood,the function of animals before that was milk,wool sacrifice.
In Gen:7:2.Clean and unclean animals are mentioned -but are not divided for food purposes but for sacrificial purposes.
After the flood , Gen:9,society must be regenerated and reordered.In Gen9:3 meat is permitted; “every creature that lives shall be yours to eat;as with green grasses, I give you these”.
Also notice after the flood the practice of polygamy also begins.