What is one of the main signs of food spoilage?

One of the main signs of food spoilage is the presence of unpleasant odors. When food begins to spoil, it undergoes chemical changes and the growth of bacteria or mold can produce off-putting smells. These odors are often a clear indication that the food is no longer safe to consume, as they signal bacterial activity and the breakdown of the food's natural components. Bright colors, while sometimes associated with freshness, can also occur in spoiled food depending on the specific item and type of spoilage, making them unreliable indicators. Firm textures might indicate freshness in some foods, while crackling sounds are not typically associated with spoilage and may indicate other characteristics unrelated to safety or quality. Understanding these signs helps in maintaining food safety and ensuring that only safe, high-quality foods are consumed.