Apparatus for conditioning crushed oil seeds e.g. soy bean material, has a fluidized bed installation with heat exchangers, heated by steam, incorporated in its reaction chamber. The crushed material passes through the chamber continuously, with a residence time of 4-8 min, and its temp. is raised to 55-75AÂ° C whilst it is fluidized with air. The apparatus takes up only a relatively small space. The treatment involves low energy consumption and despite the short residence period the product is homogeneously conditioned for immediate flaking on roll mills. Its oily components and those containing protein remain undamaged. For particular economy, the fluidizing medium is carried in a circuit to the fluidized bed with minimal thermal losses. The distribution base has nozzles which prevent deposits of fine particles of the material in the nozzle flow area.