There are many advantages of freeze dried food, and they've come a long way from 30 years ago when it was first introduced for the astronauts and for backpackers. In fact, today's freeze dried foods have all of the flavor, texture, and vitamins and nutrients of canned or other types of frozen food. In fact, there are going to be certain types of freeze-dried food that is actually better than frozen as a keeps its flavor and vital nutrients. This means that you can keep freeze-dried food for a very long period of time.
Another of the advantages you'll have is the weight, you'll have to have very good supporting shelves for canned food whereas freeze-dried food on the other hand is relatively small and takes up less space and doesn't need the support.
Many hobby exercise individuals such as those that do backpacking, bicycling and camping enjoy lightweight of freeze-dried food as well. They have found that they can pack more food for a longer period of time if they use freeze-dried food than if they try to pack traditional food. They then will just have to have a water source in order to reconstitute the food into a fully nutritious meal.
Many people store it for emergency conditions. They will store in a bunker or other type of safe area that they will need should there ever be an earthquake or other natural disaster. Of course, there are those who figure that sooner or later war will tear our country apart and store freeze-dried food as well.
The freeze and drying process for freeze-dried food as changed as well, now, they use a drying, heated and freezing process. The food is first frozen, it is then put it into a low pressure chamber where it is heated in order to allow the water to become a gas. It is then frozen again, and this allows pockets within the food that allows the expansion when it's rehydrated.
There are many advantages to freeze-dried food, and one of the best, of course, is the taste is so much better than what was originally produced over 30 years ago. The freezing and drying process is quicker, maintains better flavor, and actually keeps vitamins and nutrients intact.