Wow, I’m only learning this now.

Mayonnaise should not be left out at room temperature for more than two hours. In hot weather, this time is reduced to one hour. Beyond this period, the risk of bacterial growth increases significantly, and the mayonnaise should be discarded to prevent the risk of foodborne illness.

Spoiled mayonnaise may exhibit several signs, including an off smell, a change in color, or a separation of the emulsion. If the mayonnaise develops a sour or rancid odor, it is a clear indication that it has gone bad. Additionally, any visible mold or discoloration is a sign that the mayonnaise should not be consumed.

Food safety experts and organizations such as the USDA and the Food and Drug Administration (FDA) consistently recommend refrigerating mayonnaise after opening. These guidelines are based on scientific research that demonstrates the risks associated with leaving mayonnaise at room temperature. Experts emphasize the importance of following these guidelines to prevent foodborne illnesses.

For those concerned about the safety of mayonnaise, there are alternatives available. Shelf-stable mayonnaise packets, often used in restaurants and fast food establishments, can be a convenient option as they are designed to be stored at room temperature until opened. Additionally, some brands offer mayonnaise made with pasteurized eggs and added preservatives, which may have a longer shelf life.

To ensure the safety and quality of mayonnaise, it is best to follow established food safety guidelines. This includes refrigerating mayonnaise after opening and discarding it if it has been left out at room temperature for more than two hours. By adhering to these practices, you can enjoy mayonnaise without the worry of foodborne illnesses.