Trans fats from partially hydrogenated oils are more harmful than naturally occurring oils. Oils and fats can be hydrogenated to give a diesel substitute. Margarine made from hydrogenated soybean oil began to replace butterfat. Partial hydrogenation is then hydrogenated graphene. The xylan polymers can be hydrolyzed into xylose, which is catalytically hydrogenated into xylitol. Hydrogenated fatty acids are less prone toward rancidification. Oils may be partially hydrogenated to produce various ingredient oils. Margarines made in this way are said to contain hydrogenated fat. For example, the resulting aldehydes are hydrogenated to alcohols that are converted to detergents. Partially hydrogenated derivatives are obtained under milder conditions. Some store-bought baked goods are as well, especially those containing partially hydrogenated oils. Lard is often hydrogenated to improve its stability at room temperature. Most brands phased out the use of hydrogenated oils and became trans fat free. Totino's products contain cheese substitutes made with hydrogenated oil. Partially hydrogenated oils have been used in food for many reasons.