How can you prevent rancidity of food items at your home ?

How can you prevent the spoiling of food?

How can you prevent oxidization of iron objects?

How can we stop rancidity?

What is rancidity and how can the development of rancidity in food materials be checked ?

Define rancidity. To prevent rancidity of food containing oils and fats, some substances are added to them. What are these substances called ? some other methods to prevent rancidity.