A can exhibiting a swollen or distended appearance generally indicates internal pressure. This pressure is most often a result of microbial activity within the can, producing gases as a byproduct of spoilage. It is a visual sign that the food contained within may be contaminated and unsafe for consumption.
The integrity of food packaging is crucial for preservation and preventing illness. The presence of such distortion compromises this integrity, signifying that the hermetic seal has been breached or that internal changes have occurred. Historically, observations of deformed food containers have served as key indicators of potential botulism outbreaks and other foodborne illnesses, prompting widespread public health warnings and product recalls.
