The invention relates to a treatment device for treating food products using conditioned treatment fluid, comprising a housing (10), which defines a treatment space (18) and is provided with an inlet (12) for introducing products to be treated into the treatment space, and an outlet (14) for discharging treated products from the treatment space, with the treatment space (18) being in open communication with the environment, a conveying means (16, 20) for conveying the food products from the inlet through the treatment space to the outlet, with the conveying means (16; 20) between the inlet and outlet following a helical conveying path (26) comprising several turns one above the other, circulation means (40) for circulating treatment fluid through the treatment space, conditioning means (56; 57) for conditioning the treatment fluid.