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Good question, although I think you've got us confused with someone else. We never said "God can't change a law". God is God - He can do whatever He chooses.
What makes you think man wasn't allowed to eat meat before Noah's flood? Where does the Bible tell us that Adam and Eve were only vegetarian? Even if they were, somehow, they knew the difference between "clean" and "unclean" animals to offer for sacrifice, because they taught their sons, Cain and Abel (see Gen. 4:5). We can even assume that Adam and Eve raised animals, because in Gen. 3:14 God tells the serpent: "....Cursed are you above all the livestock and all the wild animals!"" Livestock are animals one raises for fun, food, or profit.
There was no such thing as a "vegetarian law" as you suggest.
Gen. 7:2 instructs Noah to take seven couple of every "clean animal" and one couple of animals that were not "clean" - and that tells you right there, that Noah knew about kosher ("clean" and "unclean"), which means people were eating meat BEFORE the days of Noah....The Bible doesn't explain every little detail, and sometimes things don't become clear until we've read several books of the Bible.
It's strange that people presume, just because the Mitzvot weren't record before Moses' time, that they weren't already in existence! Adam's sons knew about animal sacrifices - so God had obviously taught Adam, even though the book of Genesis doesn't tell us that.
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