Share 'Help! Thanksgiving!'

Does anyone have any suggestions on handling the "I'm a Vegetarian" subject at Thanksgiving? I love my family, but they tend to make a big issues out of things that really need no argument. This is especially hard since I just became a vegetarian two weeks ago. Is there a tactful answer I can give my family as to why I am not eating anything with meat without sounding preachy or cause a scene?