The present invention relates to a process for microparticulating of an ideal whey protein in a solution by caviataopm. The present invention relates also to microparticulated ideal whey protein preparation. In addition, the present invention relates to use of the microparticulated ideal whey protein preparation in milk based products and/or dairy products. Further, the present invention relates to a milk based product and/or a dairy product containing a microparticulated whey protein preparation.