Question

what are anti - oxidant ? why are they added to fat and oil containing food

Answer 1

these are the substances which doesn't react with air especially oxygen means they didn't help in the oxidation process with fats and oil particles of food.

they are added to stop oxidation of fat and oil molecules with air especially oxygen.

for example preservative, nitrogen.

Answer 2

Anti oxidants are substances which prevents oxidation of other substances. They are added to fat and oil containing foods to prevent their oxidation.Otherwise, the food would become rancid and get spoilt.