What is a common sign of food spoilage?

A common sign of food spoilage is characterized by unusual odors and changes in color. When food begins to spoil, it often undergoes various chemical and biological changes due to the growth of bacteria or fungi. These processes can produce off-putting smells that are distinctly unpleasant, as well as alterations in the food's color, making it appear dull or noticeably different from its fresh state.

Unusual odors are particularly indicative of spoilage since they can indicate the presence of spoilage organisms or the production of harmful substances. Similarly, changes in color can signal that the food is no longer safe for consumption, as fresh food should maintain its typical appearance. In contrast, bright colors and firm textures are indicators of freshness, while consistent texture and aroma suggest the food has remained stable and is likely still good. An indistinguishable appearance does not provide enough information regarding the quality or safety of the food. Therefore, recognizing unusual odors and changes in color is crucial for identifying spoiled food and ensuring food safety.