web analytics

Why do canned foods stay fresh longer?

It was not until French scientist Louis Pasteur discovered in 1860 that food goes bad because of bacteria that people realized how canning food works. According to Pasteur, bacteria which are usually present in fresh food and in the air breaks down substances in the food and make them useless or harmful to man.

To preserve food, it was discovered that heating kills the bacteria in the food, and the sealing of the container prevents more bacteria from getting into the food. This led to the invention of canning. Food inside a can should stay fresh for as long as there is no opening in the can.

Leave a reply