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Freeze-dried vs dehydrated

The Difference between Freeze-Drying and Dehydrating

  • Freeze-dried food refers to the food preserved by rapidly freezing and then subjecting to a high vacuum which removes up to 99% of moisture. Dehydrated food refers to the food dried in order to remove a considerable amount of moisture but much less than freeze-drying.  
  • Therefore, the shelf life of freeze-dried food can be longer, up to 25 years (unopened and properly stored) while the shelf life of dehydrated food is much less and best kept refrigerated.  Furthermore, 97% of the original nutrients are retained in the freeze-dried food while only 5-60% of nutrients are retained in the dehydrated food. 
  • More importantly, freeze-drying results in a high-quality product due to the involvement of a lower temperature. Therefore, the quality of the rehydrated product is excellent.  
  • Also, both methods prevent the growth of microorganisms including mold, yeast, and bacteria on the food by removing water. 
  • Freeze-Dried treats weigh less than dehydrated treats due to a lower amount of moisture.
  • Freeze-drying is a modern industrial technique of food preservation while dehydration is an ancient technique used since 12,000 BC. 


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