For the source text click/tap here: Sanhedrin 59
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Rav Yehudah says in the name of Rav: Adam was not permitted to eat meat. This is as the verse states: for you it (the vegetation) will be yours for food, and for all the animals of the land.
This implies that the animals are not given for man to eat. When the sons of Noach arrived, Hashem permitted this, as the verse says: I have given you everything (including animals) to be like the stalks of grass. One would think they did not have to keep the prohibition against eating a limb of a live animal.
We explore the possibility of a return to vegetarianism in light of torah values.