What are the signs of food spoilage?

The signs of food spoilage are typically characterized by observable changes in the food's physical and sensory attributes. Off-odors indicate that bacteria or fungi may be breaking down the food, resulting in the production of unpleasant smells that are not present in fresh food. Discoloration suggests chemical changes or microbial growth, making the food visually unappealing and potentially unsafe to consume. Changes in texture often occur as food decomposes, such as becoming slimy or mushy, which are adverse signs of spoilage. Additionally, the presence of mold, which often appears as fuzzy or speckled growths on the food, is a clear indicator that the food is no longer safe to eat.

In contrast, other options describe conditions that either represent freshness and safety or incorrectly suggest characteristics associated with spoilage. Improved aroma, vibrant color, and consistent texture are signs of freshness, while temperature stability and absence of moisture are conditions generally associated with proper food storage rather than spoilage.