What are the signs that food has spoiled?

The signs that food has spoiled often include off odors, discoloration, and unusual texture. When food spoils, it undergoes various chemical and biological changes that can make it unfit for consumption. Off odors are usually the result of bacteria breaking down the food and producing waste products that emit unpleasant smells. Discoloration can indicate oxidation or the growth of mold, which are typically signs of spoilage. Additionally, unusual texture, such as sliminess or mushiness, can indicate that the food has deteriorated and may harbor harmful bacteria.

Other options, such as high temperature and moisture, may contribute to spoilage but are not direct indicators of food being spoiled. Bright colors and strong fragrances may be associated with fresh food, while clear packaging with no visible signs does not account for the possibility of spoilage that could be invisible to the naked eye. Hence, recognizing the specific signs of spoilage, as indicated in the correct option, is crucial for food safety.