What is a potential indication that a can of food is spoiled?

A can of food exhibiting bulging ends is a significant indication that the contents may be spoiled. Bulging occurs when gases produced by bacteria or other microbial activity build up inside the can, which can happen if the can was improperly processed or has become contaminated after processing. This bulging disrupts the integrity of the can and indicates potential spoilage, making it unsafe to consume.

In contrast, a fully sealed can generally suggests that the food inside is not exposed to outside contaminants, while a can showing no signs of bulging indicates that it is under normal pressure. Discoloration on the label may not be a reliable indicator of spoilage, as it could be due to other factors such as exposure to light or moisture but does not necessarily impact the food’s safety. Thus, the bulging of the can is a critical visual cue that should lead to caution and further inspection.