Starchy foods: steamed buns, rolls, bread, etc. Putting them in the refrigerator will speed up the rate at which they dry out and harden. If you can't eat them in a short time, you can seal them and put them in the freezer to freeze.

Bread, steamed buns, rolls, white cake and other starchy food, a day or two can be put at room temperature to save, if the refrigerator will accelerate the food dry and hard, this is because of a process known as "starch aging back to life" due to this change will occur at room temperature, but in the refrigerator temperature occurs at a faster rate.

Extended information:

Freezer refrigerator door shelves: Because the refrigerator door is often open, this location by the influence of the warm air is greater, so it is not suitable for storage of easily deteriorated food, such as open cooked meat and milk, etc., and suitable for the storage of antimicrobial resistance to strong food, such as open cooked meat and milk. Stronger food, such as opened pickles, jam, sesame paste, sour food, etc..

The upper level of the freezer: suitable for storing cooked and salted meats, yogurt and hard cheeses.

Lower level of the freezer: can store food that needs to be heated quickly, such as leftovers, boiled eggs and fish. Also, non-leafy vegetables and fruits that are prone to frostbite can be stored here.

Reference:

People's Daily Online - There are rules for putting these foods in the refrigerator