Proper storage helps prevent rancidity of food, particularly oil and oil-containing products. Keeping oil in tightly capped bottles away from exposure to air, direct heat and sunlight aids in controlling the onset of rancidity.
Water and microorganisms also cause some fatty foods to become rancid following hydrolytic rancidity and microbial rancidity, respectively. Keeping fatty food away from water and microbes is essential.
Another way to prevent or reduce the onset of rancidity is to use antioxidants. Some natural antioxidants used for food include ascorbic acid and tocopherol. However, the use of synthetic antioxidants, such as butylated hydroxyanisole and ethoxyquin, gives the food a longer shelf life.