Genesis Chapter Nine 'Was man vegetarian?"

In Verse 3 we read “Every moving thing that lives shall be food for you.”
We know from Genesis 1:29 that God created man to be a vegetarian. When did man begin to eat animals? It is not clear when man began to eat animals. Some think that since Abel offered animal sacrifice that he was eating animals, but it does not say that. It is possible that some men were eating animals before the flood, but I don’t think the followers of God were doing this. But after the flood we find God giving mankind permission now to go ahead and eat flesh. Why this changed I am not sure but I am glad it did!