Why does food go bad? What are the main ways of processing foods to prevent rotting and the principles on which they are based?

1) Rotting food is caused by rotting bacteria.
2) To prevent decay, it is necessary to slow down the growth of bacteria on food. For this purpose, heat treatment of products is carried out. High temperature (during boiling, sterilization, pasteurization) kills bacteria. Low temperatures (when frozen) slow down their reproduction. Drying food prevents bacteria from easily assimilating the nutrients found there.

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