I have a SIL and two neices who are vegetarians. They vary in degrees though--One eats shrimp and tuna; one eats eggs and cheese; one is a full fledged vegan.
I'm none of the above but could easily be a pesatarian or a pollo-pesatarian. (That's a person who either eats fish and veggies or fish, fowl, and veggies.--I can live without red meat.)
Whenever I''m tempted to eat something I shouldn''t, I remember the following: "Don''t eat for the moment''s pleasure, for when that moment''s gone, the consequences will stay with you, from that moment on."