There really is no way to know for sure, but a number of people have put together information from Biblical references and from the little history available form the time. He definitely ate meat only rarely. Here is the reference:
Jesus followed the strict dietary restrictions of Judaism. It is all spelled out in Leviticus and Deuteronomy, if you want to wade through it. Ask a practicing Jew today and they can tell you all about it.
Yeah I’m pretty sure he ate fish since he dispensed it to others, but I’m betting he was mostly vegetarian. John the baptist (Jesus’s cousin) survived in the wild on honey and locusts…...although I guess eating a locust is still killing something….....
What I want to know is if he was swigging that wine!