A method for producing modified flour or modified powdery to granular, especially fine-grained starch-containing products made of a ground or comminuted raw product containing predominantly starch, such as starch or flour from cereals or tubers, especially wheat, rye flour, cornflour, potato flour, tapioca flour, etc. Also disclosed is a system for carrying out said method. Agglomerates obtained by extrusion and agglomeration have a lower agglomeration level than the individual non-agglomerated particles when dissolved/suspended in water.