In order to inform consumers of the presence of engineered nanomaterials in food, it is appropriate to provide for a definition of engineered nanomaterials. Taking into account the possibility of food containing or consisting of engineered nanomaterials being a novel food, the appropriate legislative framework for that definition should be considered in the context of the upcoming review of Regulation (EC) No 258/97 of the European Parliament and of the Council of 27 January 1997 concerning novel foods and novel food ingredients ( 12 ).) .