Apparatus for preparation of a food product, said apparatus comprising: a loading device intended to load a food product inside a casing, a braking device, a supply device for supplying the food product into the loading device, and a movable frame or carriage for supporting the loading device, wherein the loading device comprises two tubular filling bodies or filling tubes (14, 15) intended to support the casing, two transfer ducts (21, 22) and a twisting device intended to rotate each filling tube (14, 15) about its axis, wherein the supply device comprises an entry duct for supplying the food product into the two transfer ducts (21, 22), wherein one of the transfer ducts is able to be aligned and placed in fluid communication with a filling tube and the other of the transfer ducts is aligned and able to be placed in fluid communication with the other filling tube, and wherein the apparatus includes a rotation unit intended to cause rotation of the loading device and angularly displace the loading device with respect to the braking device and a displacement drive member connected to said movable frame or carriage for moving the loading device with a displacement with to-and-fro movement or with an approaching and separating movement relative to the braking device and to the entry duct of the supply device, wherein the rotation unit includes a rotation drive member fixed to said movable frame or carriage and able to be moved by said displacement drive member together with the loading device between a position for supplying the food product and a free position, or non-supplying position, wherein, in said supplying position, one of said two transfer ducts (21, 22) is in fluid communication with said entry duct so as to allow transfer of food product from said entry duct into one of said tubular filling ducts or filling tubes (14, 15) and wherein, in said free position, said two tubular filing bodies or filling tubes (14, 15) are spaced from said braking device so as to allow a rotation of the loading device and wherein, at least in said free or non-supplying position, one of said two transfer ducts (21, 22) is able to close or interrupt fluid communication with said entry duct. a loading device intended to load a food product inside a casing, a braking device, a supply device for supplying the food product into the loading device, and a movable frame or carriage for supporting the loading device, wherein the loading device comprises two tubular filling bodies or filling tubes (14, 15) intended to support the casing, two transfer ducts (21, 22) and a twisting device intended to rotate each filling tube (14, 15) about its axis, wherein the supply device comprises an entry duct for supplying the food product into the two transfer ducts (21, 22), wherein one of the transfer ducts is able to be aligned and placed in fluid communication with a filling tube and the other of the transfer ducts is aligned and able to be placed in fluid communication with the other filling tube, and wherein the apparatus includes a rotation unit intended to cause rotation of the loading device and angularly displace the loading device with respect to the braking device and a displacement drive member connected to said movable frame or carriage for moving the loading device with a displacement with to-and-fro movement or with an approaching and separating movement relative to the braking device and to the entry duct of the supply device, wherein the rotation unit includes a rotation drive member fixed to said movable frame or carriage and able to be moved by said displacement drive member together with the loading device between a position for supplying the food product and a free position, or non-supplying position, wherein, in said supplying position, one of said two transfer ducts (21, 22) is in fluid communication with said entry duct so as to allow transfer of food product from said entry duct into one of said tubular filling ducts or filling tubes (14, 15) and wherein, in said free position, said two tubular filing bodies or filling tubes (14, 15) are spaced from said braking device so as to allow a rotation of the loading device and wherein, at least in said free or non-supplying position, one of said two transfer ducts (21, 22) is able to close or interrupt fluid communication with said entry duct.