Food is preserved by preventing growth of microorganisms, retarding oxygen, and inhibiting enzymatic processes. Finally they are sealed in containers to keep them that way. Other than making them safe to consume preserving also involves maintaining nutritional value, texture, color, and flavor. Food can be preserved by several methods to last a long time. The most widely used are canning, dehydrating, and freezing. Vacuum sealing dehydrated and frozen food extends their shelf life as well. Prepping Connections Store supplies all your survival food preservation needs.