Page 4 - Guide to fresse foods

Because of its long shelf life and nutrition
preservation, numerous commercial companies
produce freeze dried food for families, as well as
for the military, with their well-known MREs (Meals
Ready to Eat). By just adding water, the food is quickly One simply adds water to rehydrate the food, and it
rehydrated and ready for consumption.
is ready to be eaten, retaining its original fresh flavor,
aroma, and appearance. Freeze-dried food rehydrates
How Freeze Drying Works quickly and easily because the freeze drying process
leaves microscopic pores in the food—pores that were
During the freeze drying process, food is initially caused by ice crystals that sublimated out of the food in
frozen to -40 to -50 degrees Fahrenheit. Once the the drying process.
food is frozen, the appliance creates a powerful
vacuum around the food. In this environment the
food is gradually warmed, even though it continues Advantages of Freeze Drying
to stay very cold. When the temperature of the food This method of food
gets a little above zero Fahrenheit, the water that preservation causes
is in the form of ice changes to a gas without ever little damage to the
becoming a liquid. nutritional value of the
food being preserved
That is why the vacuum environment is so important. compared to other
As was just mentioned, in that environment, water methods that use higher
sublimates (evaporates) out of the food at just 5 temperatures, such as
degrees Fahrenheit. Water cannot exist as liquid in canning or dehydration.
a vacuum and, as it warms, is drawn out of the solid Freeze drying does
frozen food as a gas. When done properly, freeze not shrink or toughen
drying virtually removes 100 percent of the water the food, and it retains
from the food. This water freezes to the stainless its aroma, flavor, and
steel cylinder of the freeze dryer and is then nutritional content.
defrosted at the end of the process. The following pictures
were taken of food
The freeze dried food should then be properly sealed that has already been
to remove the oxygen and prevent reabsorption of freeze dried. As you can
moisture. The food can be stored at room temperature see, the meat, cheese,
for long periods (up to 25 years), with no need for vegetables and fruits
refrigeration. This is possibly because the almost non- still look fresh. And, in
existent water content in the food inhibits the normal reality they are. Simply
process of deterioration and spoilage. add water—it is delicious.

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