The present invention is directed to a coding insert (100) for associating to a food ingredient capsule (11) adapted to be functionally inserted in the cavity of a food preparation machine (1), characterized in that said coding insert (100) is a disc or a ring that comprises at least one deformable portion (17, 19, 20, 21, 22, 23, 25, 26, 27, 29, 31, 33, 34, 35, 38) that is deformed when said insert is inserted into the machine cavity, and/or when said cavity is closed, so that at least one machine operational parameter is set by detection of there action force on the machine cavity by the deformed portion, so as to customize the machine brewing functional parameters to each coding insert (100) inserted therein with the capsule it is associated with.