Here are some interesting verses from the Bible to ponder. They show that people and animals were all vegetarian from the beginning all the way up to the flood, where God gave permission to eat meat. Before the flood, the animals were not afraid of man. Then in the new testament he gave permission for all foods, but gave guidelines for pushing this onto other people.

From The Message

Genesis 1:29-

Then God said, "I've given you
every sort of seed-bearing plant on Earth
And every kind of fruit-bearing tree,
given them to you for food.
To all animals and all birds,
everything that moves and breathes,
I give whatever grows out of the ground for food."
And there it was.

Or in NKJV

And God said, “See, I have given you every herb that yields seed which is on the face of all the earth, and every tree whose fruit yields seed; to you it shall be for food. Also, to every beast of the earth, to every bird of the air, and to everything that creeps on the earth, in which there is life, I have given every green herb for food”; and it was so.

Also, Genesis 9:1-

God blessed Noah and his sons: He said, "Prosper! Reproduce! Fill the Earth! Every living creature--birds, animals, fish--will fall under your spell and be afraid of you. You're responsible for them. All living creatures are yours for food; just as I gave you the plants, now I give you everything else. Except for meat with its lifeblood still in it--don't eat that.

Romans 14:20-23

Do not destroy the work of God for the sake of food. All food is clean, but it is wrong for a man to eat anything that causes someone else to stumble. It is better not to eat meat or drink wine or to do anything else that will cause your brother to fall. So whatever you believe about these things keep between yourself and God. Blessed is the man who does not condemn himself by what he approves. But the man who has doubts is condemned if he eats, because his eating is not from faith; and everything that does not come from faith is sin.