The practice of warming soup regularly as it concerns food preservation is essentially to

Warming soup regularly as a food preservation practice is essentially done to kill bacteria that can cause the soup to spoil. When soup is heated to a high temperature, it destroys any harmful bacteria that may be present, making it safe to eat for a longer period of time. This is because bacteria thrive in warm, moist environments, and by heating the soup, you eliminate these conditions and reduce the risk of spoilage. Warming soup regularly does not help to break down cellulose, remove excess water, or retain taste.