Which of the following is a sign of food spoilage?

A sign of food spoilage is often indicated by an off or sour smell. When food begins to spoil, it undergoes chemical changes and the growth of bacteria can produce compounds that have unpleasant odors. These smells can serve as an important indicator for consumers or food handlers that the food is no longer safe to consume. Recognizing these smells is crucial for maintaining food safety and preventing foodborne illness, as spoiled food can pose serious health risks.

In contrast, a dry texture can sometimes be a sign of aging but does not necessarily indicate spoilage, as some foods naturally have a drier texture. Intense brightness of color can actually indicate freshness rather than spoilage, as vibrant colors are usually associated with ripeness and good quality in fruits and vegetables. A fresh appearance generally indicates that food is in good condition and safe to eat, which is the opposite of what you would look for as a sign of spoilage.