Why are salt or sugar added to yolks before egg products are frozen?

Salt, sugar, or corn syrup are added to egg yolks or whole eggs before they are frozen to prevent gelation, which is the undesirable thickening of the product that occurs during the freezing process. While egg whites can be frozen successfully without any additives, these ingredients are necessary to maintain the functional quality of yolks and whole eggs when stored at frozen temperatures.1