Explain the principles of food preservation. Classify the foods based on perishability.

### Principles of Food Preservation

Food preservation is the process of treating and handling food to stop or greatly slow down spoilage caused by microorganisms, enzymes, and other factors. It aims to extend the shelf life of food while maintaining its safety, nutritional value, flavor, and texture. Several principles are employed in food preservation:

1. Temperature Control: Temperature management is crucial in preserving food. Refrigeration slows down the growth of microorganisms and enzymatic reactions, while freezing can halt them altogether. Heat treatments, such as pasteurization and sterilization, destroy harmful microorganisms.

2. Water Activity Reduction: Microorganisms require water to grow. By reducing the water activity (aw) through methods like drying, salting, or adding sugar, the growth of bacteria, yeasts, and molds is inhibited.

3. Acidification: Low pH levels inhibit the growth of many microorganisms. Pickling and fermentation processes lower the pH of foods, making them less _______ __________ _____ __________ __________ ___ ___ _____.
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