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It spoils for two reasons

1) when air gets at it, it oxidizes and its quality diminishes.

2) bacteria from the air land on the food and begin to grow, this causes an unpleasant smell, bad taste, the food discolors and becomes dangerous to eat.

Food can also spoil due to the growth of microbes indigenous to the food. For example: Milk will spoil because pasteurization does not sterilize the milk. Eventually, the microbiological load will make the milk inedible.

Foods can also contain enzymes which will break down the structure. The ripening of fruit is related to enzymes. Most foods spoil due to microbiological growth. Molds, yeast and/or bacteria can sour food, change the appearance and texture and make the food generally unappetizing and undesirable.

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13y ago

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