Purpose Preservatives are added to foods to keep them safe for consumption by helping to prevent spoilage. Preservatives also help foods maintain their appearance, taste and texture. Source Preservatives can come in many forms, from natural and artificial to chemical. Sugars, salts and vinegars are examples of natural food preservative, which are often used to delay the growth of bacteria in foods. Antioxidants are examples of chemical preservatives. Antioxidants help to reduce oxidation in foods, increasing the shelf life of foods and preventing spoilage. Use Jellies, cured meats, oils, cereals, dressings, fruits, vegetables, and baked goods