What is a key sign of food spoilage?

A key sign of food spoilage is the presence of off odors, discoloration, or unusual texture. When food begins to spoil, it undergoes various biochemical changes that affect its quality and safety. Off odors are often produced by the breakdown of proteins and fats, while discoloration can indicate oxidation or microbial growth. Unusual textures, such as sliminess or mushiness, can result from bacterial activity or the breakdown of cellular structures in the food. These indicators are critical for assessing the freshness and edibility of food items, helping individuals avoid consuming spoiled products that could lead to foodborne illness.

Other signs, such as unusual tastes and smells, presence of insects or pests, and a longer shelf life, can indicate issues; however, they do not encompass the comprehensive indicators of spoilage as effectively as the combination of off odors, discoloration, and unusual texture. Tastes can suggest spoilage, but they generally become relevant after other sensory changes have already occurred. Similarly, although the presence of insects can indicate contamination or spoilage, it is not as universally applicable as the listed signs of discoloration and off odors. Finally, a longer than usual shelf life does not indicate spoilage; conversely, it may suggest proper preservation methods or the presence