Meat

1:29 And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat.

I think in context it's clear that "meat" means "food".

So, God has given people the grains and fruit trees for them to eat, but animals aren't mentioned here.  This suggests to me that the authors were vegetarians.