What are the signs that food may be spoiled?

Food spoiling is often indicated by various visible and sensory signs. Recognizing these signs is crucial for food safety and preventing foodborne illnesses. Unusual odors can signal that bacteria or mold has developed, which can make food unsafe to consume. Color changes can also indicate spoilage, as certain foods may turn darker, dull, or display spots that are not usual for their fresh state. Visible mold is another clear sign of spoilage; mold can be harmful and indicates that food is no longer safe.

While normal smell and appearance suggest that food is still good to eat, packaging damage alone does not necessarily mean the food inside has spoiled, as it may still be safe if the protective barrier is maintained. Food temperature changes can be a concern, but they alone do not provide direct evidence of spoilage without considering the accompanying sensory cues. Therefore, the combination of unusual odors, color alterations, and visible mold strongly indicates that food may be spoiled and should be discarded.