The cold slows down the growth of bacteria responsible for food decomposition, which allows them to be preserved for longer.
Cold greatly slows down or even sometimes completely stops the growth of microorganisms like bacteria and yeasts. Why? Simply because these little creatures need warmth to multiply rapidly. At low temperatures, their metabolism runs at a slower pace: less energy available, less multiplication. As a result, foods stored in the cold are much less likely to be contaminated or to spoil. It doesn't necessarily kill all the germs, but it keeps them under control and allows food to remain edible for a longer time.
Cold significantly slows down the rate of chemical and enzymatic reactions responsible for food degradation. The cooler it is, the more the enzymes responsible for browning or texture changes are "asleep" and work at a slower pace. The same goes for oxidation, the phenomenon that causes a rancid taste or loss of freshness; it is largely impeded by low temperatures. The result: foods retain their color, taste, and pleasant texture longer without developing undesirable aftertastes.
When food is stored in the cold, its flavor, texture, and appearance are generally better preserved. Why? Because low temperatures greatly slow down the activity of enzymes, those small substances naturally present in food that gradually alter their taste and color. By keeping food cool, heat- or light-sensitive vitamins, such as vitamin C, degrade less quickly, allowing a large part of their initial nutritional qualities to be retained. Similarly, the structure of proteins and plant fibers changes much less, preventing food from becoming mushy, discolored, or less appetizing. In short, fewer chemical or biological changes simply mean a tastier and more nutritious plate on the table.
Molds love warm and humid places to grow quietly. By placing food in the cold, their growth is significantly slowed down: the cold limits their activity and prevents these tiny fungi from multiplying quickly. This helps avoid having food quickly covered with unappetizing green or white spots while also limiting the formation of sometimes toxic substances that are harmful to health. Keeping food cold is like putting molds in a prolonged pause mode, without necessarily eliminating them completely.
Keeping food cold helps to extend its shelf life simply because it slows down the growth of microbes. Fewer microbes developing means less risk of your food becoming inedible quickly. This way, you can store your groceries longer in the fridge, avoid waste, and save money. Meats, vegetables, dairy products: all these foods remain in good condition much longer when stored at low temperatures.
A full refrigerator consumes less energy than an empty one because stored food retains cold better and allows the appliance to operate more efficiently. That's a good excuse to fill up your fridge and avoid wasting energy!
When foods are thawed and then refrozen multiple times, ice crystals form, altering the texture and taste while promoting microbial growth. That is why it is advised to avoid refreezing food that has already been thawed.
The ideal temperature for a domestic refrigerator is between 0 and 4 °C, as it is within this range that bacteria are least active, allowing for optimal food preservation without freezing.
The earliest cold preservation systems date back to antiquity, when the Greeks and Romans used snow and mountain ice to cool their food and beverages.
Generally, freezing effectively preserves the vitamins and minerals found in food, especially if they are frozen quickly after harvesting or purchasing. However, some temperature-sensitive vitamins, such as vitamin C, may be slightly reduced during the freezing and thawing process.
In general, red meat can be stored in the freezer for 6 to 12 months, while poultry can be kept for 8 to 12 months. Ground meat, on the other hand, is best stored for 3 to 4 months to preserve its flavor and nutritional qualities.
During freezing, the water present in the food transforms into ice crystals, which alters the cellular structure. Upon thawing, this structural change leads to water loss, which can affect the texture, taste, and appearance of your food.
The optimal temperature for storing food in the refrigerator is between 3°C and 5°C. This range effectively slows down bacterial growth while preserving the nutritional and taste qualities of the food.
Refreezing thawed food is generally not recommended, as it promotes the growth of microorganisms and alters the nutritional and sensory qualities of the food. However, you can refreeze thawed food if you have cooked it at a high temperature after thawing.
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