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The main goal of food preservation is to remove moisture, so food does not deteriorate and grow mold. Dehydration removes 90-95% moisture, while freeze-drying clears 98,099% of the water.
Dehydration of your own food at home usually leaves 10% humidity, but professional technology is more thoroughly dehydrated, so it can have a longer shelf life.
2. Shelf life
Moisture removal rate directly affects shelf life. Dehydrated foods such as dried fruits, vegetables and powders have a shelf life of about 15-20 years; the shelf life of dehydrated foods such as honey, sugar, salt, hard wheat and oats can be extended to more than 30 years.
Frozen dehydrated foods, on the other hand, have a longer shelf life, such as dried fruits and vegetables that can be preserved for 25-30 of years.
3. Nutritional ingredients
Freeze-drying retains most vitamins and minerals, according to a study by the American Health Agency. But compared with fresh fruits and vegetables, freeze-dried foods lack some vitamins, such as vitamin C, which breaks down faster. Dehydration does not alter food fiber or iron composition. However, dehydration breaks down vitamins and minerals during the fresh-keeping process, so the nutritional value is not as good as frozen dry foods.
Dehydration tends to cause the loss of vitamins A and C, nicotinic acid, riboflavin and thiamine.
4. Appearance and structure
One of the main differences between dehydration and freeze-dried foods is the appearance. Dehydrated food will become brittle and hardened, and frozen dehydrated food into the mouth immediately softened. Weight is another difference.
Freeze-dried foods weigh much less than dehydrated foods.
Dehydrated food needs to be eaten after cooking. Many times, they also need to use condiments. This means that it takes time to cook the product in hot water and eat it after cooling. It takes between 15 minutes and 4 hours to prepare dehydrated food. However, freeze-dried foods require only boiling water.Add hot or cold water and wait at least 5 minutes to eat.
In general, dehydrated foods are cheaper than cold and dry foods.
Freeze-dried and dehydrated foods have their own pros and cons, and dehydrated foods are clearly a better option if the budget is tight.