A containment body for making a cup-shaped capsule for making beverages comprising a lateral wall (4) that, in a zone of it closer to an upper edge (5) than to a bottom wall (3), is provided with one or more retaining elements (8) projecting towards the central axis in a plane substantially perpendicular to the central axis, the one or more retaining elements (8) forming between them and the bottom wall (3) an undercut seat (9); and a method for making capsules comprising different quantities of powdered food substance using said containment body (1) and positioning an upper filtering element (16) either coupled to the undercut seat (9) or positioned close to a lid (15).