There were determined the isotherms and the kinetics of the process of adsorbing water vapour by mixtures of powder foods and their agglomerates produced using a method of repeated wetting in a fluidized bed that was pneumatically or mechanically generated. The mixtures were made of products in the form of powders; the products applied were: whey, isolate of milk whey protein, isolate of soya, glucose, and fat in a liquid and a powdered state. The mixtures had a composition pattern of the milk powder. The effect of wet agglomeration in a fluidized bed on the water vapour adsorption by multicomponent food powders depended on its character. The effect of changes, aiming at decreasing the adsorption capacity of water steam by agglomerates of carbohydrate-protein mixtures and carbohydrate-protein-fat agglomerates, depended, first of all, on their compo-sitions, and, to a lower degree, on their structure coupled with the method of agglomeration.