a process for deproteinizing milk products , such as milk or whey , is disclosed . in connection with the steps of acidifying and heating the milk product , the milk product is also demineralized at least to some extent prior to the precipitation of the serum proteins . by means of this demineralization , a destabilization of the proteins is attained , allowing these serum proteins to be precipitated by acidification and heating . the milk products may be deproteinized in dependence upon the degree of demineralization , and the amount of serum protein can be reduced to approximately 0 . 2 % or less . also , partial or complete demineralization of milk proucts permits a lower acid proportion in the product by maintaining acidification at the same ph value . reduced acidification time is also noted .