By law, any manufactured food containing soy protein must say so on the label. Check labels carefully, because soy is added to an increasing number of processed foods. Snack bars and breakfast cereals are frequently soy-fortified, but soy can also be found in a wide variety of foods, including baked goods, canned tuna, crackers, sauces, and soups. NOTE: highly refined soybean oil is generally considered safe, and will not be highlighted on food labels. Soybean oils labeled cold pressed, expeller pressed or extruded may contain some soy protein.