 The definition of vegetarianism throughout Europe is not uniform, creating the potential for products to be labelled inaccurately.Throughout Europe the use of non-vegetarian ingredients are in use in products such as beer (isinglass among others), wine (gelatine and crustacean shells among others) and cheese (rennet).Since May 2009, Belgium has had the first city in the world (Ghent) with a weekly "veggie day".