Read for secret (lactose-containing) ingredients
Read for secret (lactose-containing) ingredients. Although milk and foods made from milk are the only natural sources of lactose, milk derivatives are often added to prepared foods, including bread and other baked goods, processed breakfast cereals, instant potatoes and soups, margarine, lunch meats, salad dressing, candy and powdered meal-replacement supplements. If you can't tolerate lactose, be sure to read labels carefully.