I'm a vegetarian, still nursing, and my almost one-year old is too, pretty much by default. Whats great is that she has a really wide pallate - eats just about anything I give her, loves broccoli and tofu and even spicy food.
My husband is not vegetarian, but basically eats that way most of the time because he admits to being too lazy to cook meat for himself. I figure if my daughter really wants to eat met as she gets older, its her decision. I'm determined to not push my beliefs on her, plus doing that could backfire anyway.
I would not worry about eating disorders! A varied and healthy diet is probably better at preventing such a thing anyway. I was not raised vegetarian but several friends were and I can tell you none of them are starving themselves to death, although a few started eating meat with a vengeance as they got older!
One thing I avoid is completely restricting treats. I don't give her sweets with refined sugar at this age but I can tell she already has a sweet tooth (like her mom). My sibs and I were rarely allowed junk food, and although I have a pretty health diet now, I grew up obsessing about the Cheetoes and Hostess products that my friends were allowed to have.
So it's an old cliche' but true I think, everything in moderation, and lots of variety.
On a related note, I am looking for any good online resources or books that have tips about raising your kid vegetarian so if you have any feel free to pass them along.