Yes there is, in freeze-drying process they use a cold temperature
and in dehydrated food they use warm temperature. In the freeze-frying process
the fresh foods are frozen first then the moisture removed in a vacuum chamber
and since the food remains frozen during the process, the food's cell structure
don't change.
There is a recall on some of these. Check it out here:
http://www.cpsc.gov/cpscpub/prerel/prhtml11/11104.html
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