It's difficult to be definitive about what you ought to eat, and ought not to eat, if you're a veggie (or any other sort of '-tarian'). Why not just make a list, for your own purposes, of what you're prepared to eat, and what you're not prepared to eat? That's, more or less, what I did.
Of course if such a list had to itemise absolutely everything, it'd be not only tedious but utterly unworkable. To see what I mean, look at Leviticus. Pages and pages of "thou shalt not eat"s, and that's just for Kosher (they got it wrong anyway: Levit. allows you to eat 'locusts', but the Beth Din thinks different...)
So what I've decided is, nothing that comes from a killed mammal or bird. Simples. It means fish and invertebrates are OK. Also eggs and milk etc. (I shyly sidestep the difficult ethical stuff on dairy industry, 'cos my morals ain't that good...)