The invention relates to a device for inserting an interleaving paper between a first and a second food slice, or a second and third food slice, a third and fourth food slice, etc., wherein the interleaving paper is guided in a channel and, in a time interval between the slicing of the first food slice and the slicing of the second food slice, exits the channel and enters a slicing region, wherein the channel is designed in such a way that the channel shapes the flat cross-section of the interleaving paper. The invention further relates to a slicing device and an interleaving paper.