What could be a sign of food spoilage?

Food that has an off odor or unusual color is a clear indicator of spoilage. When food begins to spoil, microbial growth, chemical changes, or enzymatic breakdown can lead to noticeable changes in its smell and appearance. An off odor is often one of the first signs that the food is no longer safe to eat, as it is typically caused by the presence of bacteria or other microorganisms that produce waste products or toxins during their growth. Unusual color changes can also indicate spoilage, as they may result from the degradation of pigments in the food or the growth of mold or bacteria.

In contrast, clear labels, recommended storage temperatures, and intact packaging are all good practices that do not indicate spoilage. Clear labeling helps in identifying the product and its contents but does not affect the quality of the food itself. Storing food at recommended temperatures helps preserve its freshness and prevents spoilage, while intact packaging signifies that the food has not been exposed to contaminants.