before the flood nobody ate meat, only vegies and fruit.
In the book of Daniel it is reported that he refused to eat meat and this was his only sin he commited when he lied about that.

For myself. I wasn't eating meat from my birth until I grew up and went out of my parents home. Still I prefer good vegetarian meals now. Most people don't know about the varieties possible. It's fantastic and you feel a lot more healthier and energetic than otherwise.