The podcast episodes provided discuss various aspects of food preservation, including the history and development of technologies like refrigeration, the impacts of these technologies on food systems and culture, and traditional preservation methods used by indigenous communities.

For example, the episode "Spring a leaker: Assange goes free" mentions the potential benefits of tinned foods in terms of preservation and freshness, while the episode "How Your Refrigerator Changed Your Life & Why Are There Volcanoes?" delves deeply into the effects of refrigeration on preserving and wasting food.

The episode "Flightless Bird: Frozen Food" provides historical context for the rise of the frozen food industry and the role of ice and freezing in preserving food and transforming America's diet. Additionally, the episode "Maria Y. Orosa & the Food of the Philippines" discusses how Orosa developed innovative techniques for preserving and processing locally available ingredients in the Philippines.