By adding Antioxidant to food materials we can prevent the oxidation of food.
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@soso ur answer is also soso good:D

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Prevent the food from exposure to air and sunlight.

Add natural or synthetic antioxidants to food which slow down the oxidation. These are also called preservatives. One such preservative is ascorbic acid.

When we the composition of food item we purchase, on the packet, they mention the preservatives added to the food packet.

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