What’s The Difference Between Freeze Dried & Dehydrated Foods?

Freeze dried foods are flash frozen and then dried.
Freeze drying removes the water, not the flavor. So freeze dried foods retain virtually all their fresh food taste, vitamins and nutritional content.  Weighs less than fresh. Freeze dried foods have 98% of their water removed. This significantly reduces the food’s weight, making it easier to handle and less costly to transport. For example, 3kg of chicken weighs only 1kg after freeze drying, and rapidly rehydrates back to its original weight. Freeze drying is generally more expensive then dehydrating. To create freeze dried food, the food item is first flash frozen and then low level heat is applied inside a vacuum chamber. Doing this dehydrates the food item and results in a dried product. After that the food item is packed for long-term storage. Freeze drying retains the color, texture, shape, flavor, and nutrition of the food item.
Dehydrated Foods are top-quality foods, that have been picked at their ripeness, cleansed and trimmed to leave only the best parts.These choice foods are then dehydrated, where 98% of their moisture is removed. This is done by a highly sophisticated drying process. They are then packed in heavy-duty enameled cans, and sealed with a special inert atmosphere to ensure the longest possible storage life.

Because their bulk and weight have been greatly reduced, dehydrated foods are more compact and convenient for storing and require very little space. They offer quick mobility in the event of an evacuation alert. For example, one case of regular canned food weighs approximately 24 pounds. The same item of dehydrated foods would weigh from 36 to 45 ounces, and would be packed in just one #10 can. Dehydrated foods have approximately double the yield of regular canned foods even though their cost is much lower.

Most of us already eat dehydrated foods daily. Foods like pasta, cereal, beans, cake and baking mixes, as well as many fast foods. In dehydrating foods, water is slowly removed by cooking it out of the food item, without cooking the food itself.


You can see how the Freeze drying process works:

Freeze drying is a process which is suitable for a wide variety of industrial products. These include agrochemicals, pharmaceutical intermediates, biological products, foods and flavorings.

The purpose of freeze drying is to remove a solvent (usually water) from dissolved or dispersed solids. It is an excellent method for preserving materials that are unstable in the presence of water. In addition, freeze drying can be used to separate and recover volatile substances and to purify materials.

The freeze drying process is particularly suitable for products which are sensitive to heat, subject to oxidation, or shear sensitive.

Freeze Drying Process” title=
Once freeze dried,food products have the following benefits:

  • Appearance – Freeze dried foods maintain their original shape and texture, unlike air dried foods which shrink and shrivel due to high temperature processing. Just add water and in minutes the food rehydrates to its original form.
  • Taste – Tastes as good as fresh. Freeze drying removes the water, not the flavour. So freeze dried foods retain virtually all their fresh food taste, vitamins and nutritional content.
  • Weight – Weighs less than fresh. Freeze dried foods have 98% of their water removed. This significantly reduces the food’s weight, making it easier to handle and less costly to transport. For example, 3kg of chicken weighs only 1kg after freeze drying, and rapidly rehydrates back to its original weight.
  • Long Shelf Life – Freeze dried foods can be stored for months or years at room temperature without deterioration or spoilage.
  • Low Storage Costs – Because it can be stored at room temperature, freeze dried food does not require costly cold or chilled storage facilities, making it much cheaper to store.

More long term food storage…

 

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