Which of the following is a sign of food spoilage?

Unpleasant odors are a key indicator of food spoilage. When food begins to spoil, microbial activity, such as the growth of bacteria and fungi, often results in the production of gases and other compounds that emit foul smells. These odors are typically a reliable warning sign that the food is no longer safe to consume. It is essential for individuals handling food to be aware of the changes in smell, as they can highlight potential safety risks tied to the consumption of spoiled food.

In contrast, unchanged packaging, normal color, and chilled temperature are not indicative of spoilage. Unchanged packaging might signal that the food has not been subjected to external factors that lead to spoilage, while normal color implies that the food appears fresh and unaltered. Similarly, a chilled temperature suggests that food is being stored at a safe temperature, which helps in preserving its quality and safety. Understanding these differences helps in recognizing spoilage, ensuring food safety, and making informed decisions about food consumption.