Never thaw foods on the counter at room temperature because:

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Thawing foods on the counter at room temperature is highly discouraged primarily because it creates an environment that is conducive to bacterial growth. When food is left out at room temperature, the outer layer can reach temperatures that allow bacteria to multiply rapidly while the inner portions of the food may still be frozen. This inconsistent temperature can lead to a higher risk of foodborne illness.

Bacteria thrive in the "danger zone," which is typically defined as temperatures between 41°F (5°C) and 135°F (57°C). When food is thawed improperly, particularly at room temperature, it can spend too much time in this danger zone, significantly increasing the chances of contamination and foodborne diseases.

Proper thawing methods, such as in the refrigerator, under cold running water, or in the microwave, help ensure that food maintains a safe temperature throughout the thawing process, mitigating the risk of bacterial growth.