What are the signs of food spoilage?

The presence of off smells, discoloration, slime, and visible mold are significant indicators of food spoilage. These signs indicate that the food has undergone chemical changes or has been contaminated by microorganisms. When food begins to spoil, the natural processes of fermentation or decay result in the production of unpleasant odors and the breakdown of pigments, leading to discoloration. The formation of slime and visible mold further confirms that the food is no longer safe to consume, as these conditions typically result from bacterial or fungal growth. Understanding these signs is crucial for maintaining proper food safety and ensuring that only safe, high-quality food is consumed.

Other choices do not accurately represent spoilage; fresh aroma, bright colors, and a firm texture signify that food is in good condition, while unchanged color and texture suggest that the food is still fresh. The packaged expiration date, while important, does not provide visual or olfactory cues related to the immediate condition of the food.