The proteins in milk can appear in some unexpected places, inadvertently exposing patients to this allergen. While one might expect milk or casein (milk protein) to be in baked goods, for example, casein might also be used in canned tuna, sausages, or meats. Milk protein is even found in chewing gum, on occasion. Reviewing the list of all ingredients in processed foods is the best way to avoid exposure to milk proteins. Patients can also compile a list of safe foods in consultation with their doctor.