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Answer:
Fridges preserve the quality and safety of food because the cold slows bacterial growth and minimises spoilage.
The food you keep in the freezer can remain safe to eat for almost indefinite periods of time.
Preserving food in a high-sugar environment stops bacterial growth by reducing the food’s water content.
Similar to sugaring, salt draws water out of food and stops bacterial growth. In high concentrations, it can even destroy bacteria cells.
Keeping food canned significantly extends its lifespan – but only if done correctly. The canning process preserves food by removing oxygen through an airtight seal and containing food in an acidic, sugary, or salty environment, where bacteria cannot thrive.
Similar to canning, vacuum packing deprives bacteria of oxygen by creating an airtight atmosphere. Vacuum packing also has value as a preservation method because it preserves the quality without the need for other ingredients.