Manufacturers are always trying to improve their products and in the process may add new ingredients. For example, some of the new reduced-fat peanut butters have soy added. Cheese alternatives may or may not contain caseinates. Even if they don t, if they are made on the dairy production lines they may be at risk for cross-contamination. Egg can be found in mayonnaise, ice cream and pasta.
Most egg substitute contains egg white which can be allergenic.
It is difficult to completely separate egg whites from yolk. Consequently, it is best to avoid both when managing food allergies. Soy can be found in some low fat peanut butter, deli meats, and hot dogs. Many foods contain soybean oil. Natural flavorings may contain milk, soy or peanut.