PURPOSE: To obtain a fat- or oil-containing food, having good emulsifiability and extremely smooth texture and excellent also in nutrition and health, by homogeneously holding whey in a fat- or oil-containing product.

CONSTITUTION: Whey or a processed whey product, such as whey concentrate or whey powder, is homogeneously contained in a fat- or oil-containing product of mayonnaise, dressing, margarine, ice creams, custard pudding, cheese product, chocolate product, cosmetic cream, medicinal ointment, etc.