Why is it recommended to use shallow containers for storing leftovers?

Using shallow containers for storing leftovers is recommended primarily because they cool food quickly and evenly. When hot food is placed in shallow containers, the increased surface area allows for better air circulation around the food. This rapid cooling helps prevent the growth of harmful bacteria that can thrive in temperature "danger zones." If food cools slowly or unevenly, it can remain at temperatures that are conducive to bacterial growth for too long, posing a risk to food safety.

In contrast, deeper containers may trap heat and keep food at unsafe temperatures for longer periods, which is not ideal for preserving food safety. Hence, shallow containers play a crucial role in ensuring that leftovers are cooled down effectively and can be stored safely for future consumption.