What are common signs of spoiled food?

The correct choice highlights key indicators that food has spoiled. Off odors, discoloration, and changes in texture are all signs that the food may no longer be safe to eat. These symptoms often result from the growth of bacteria, molds, or other microorganisms that can produce harmful substances. For instance, a sour or rancid smell can indicate spoilage due to the breakdown of fats and proteins. Discoloration may signal oxidation or the growth of mold, while changes in texture might result from loss of moisture or the presence of bacteria.

Other options do not relate to signs of spoilage. Bright colors and firm textures typically indicate freshness in produce but do not signify spoilage. Increased shelf life and regular expiration dates imply that food is still good to consume; neither suggests spoilage but rather the opposite. Understanding these signs is crucial for food safety and preventing foodborne illnesses.