State and explain the various methods for preventing or retarding rancidity of food.
(i) adding anti-oxidants to food containing fats and oils.
(ii) It can be prevented by packaging fat and oil containing food with nitrogen gas which will ensure no presence of oxygen.
(iii) Refrigeration can retard rancidity.
(iv) Storing food in air-tight container.
(v) Keeping food in a dark place.
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