Which method involves a mixture of natural gases to slow down food decay?

Modified atmosphere packaging involves altering the composition of gases surrounding the food product to extend its shelf life and slow down the decay process. This technique typically reduces the amount of oxygen while increasing levels of carbon dioxide or nitrogen, resulting in an environment that inhibits the growth of aerobic bacteria and molds, which are responsible for food spoilage.

This method is particularly effective for preserving a wide range of perishable foods, as it slows down oxidation and respiration rates, thus maintaining the quality, freshness, and nutritional value of the food for a longer duration. Other preservation methods, while helpful, do not specifically involve manipulating gaseous environments to achieve the same effects on food decay.