If you’re new to Best Prices Storable Foods, this site, and you don’t know me, you need to know that I’m a real fan of the Truth. I’m dedicated to it to the point of losing sales and getting kicked out of webinars.
(Read of my experience having that happen, HERE.)
Frankly, I’m upset over lies being told on this issue. There isa lot of hype ‘out there’ about the extended life of freeze dried foods over dehydrated foods. It’s bunk and I’ll explain why:
There are three things that will deteriorate food:
• Oxygen (air)
• Heat, and
Both dehydrated and freeze dried foods (packed for long-term storage) are packaged the same ways, in Mylar bags or steel cans. In either case, they have an oxygen absorber placed in the bag or can. If that’s done right at the factory, oxygen deterioration is not a factor in properly-sealed bags or cans.
I shouldn’t have to say light is not a factor, unless you don’t know what Mylar is: A thin sheet of aluminum foil sandwiched between sheets of plastic. Light does not pass through the foil. Air might not pass through if the Mylar and the sealing are perfect. (That’s the risk you take with Mylar-packed foods!) And that’s probably why most manufacturers limit Mylar-packed foods’ shelf life to 5 years.
Heat is equally bad for both types of food and–while it won’t destroy the food, it will lower the foods’ nutritional value–there’s no difference in its effect.
When I got into the storable foods business in 1994, my supplier of dehydrated foods claimed a modest 7 to 15 year shelf life for their canned foods. And, Mountain House said
their canned freeze-dried foods would store 15-20 years and their Mylar-packaged meals, 5 years.
A Johnny-come-lately company packages their meals in Mylar bags and claims a 25-year shelf life … a very risky claim in my opinion based on the shelf-lives assigned by long-established companies! They cannot demonstrate such a shelf life because they’re not even 5 years old! You may be risking your life if you try storing their products 25 years….
Understand that I do not have an axe to grind in this argument/discussion. We sell BOTH dehydrated and freeze dried foods. It’s truth that I’m after.
The truth of the matter is that, kept at the proper temperature, both dehydrated and freeze dried canned foods will normally store 35 years+, maybe even 100 years.Perfectly manufactured and sealed Mylar might, also. It’s just riskier. (One real danger with pouches is mice/rats chewing through them. We’ve seen it …)
Dehydrated foods will last just as long as freeze dried. The only reason people say FD will last longer is to make a sale. It costs a lot more to produce freeze dried foods because of the added energy needed.
Volume comparison: Dehydrated foods are processed raw and they shrivel in size. Freeze dried foods are cooked, then flash-frozen, then placed in a vacuum chamber to draw off the ice crystals. That takes a lot of energy, and extra manpower, and makes freeze dried foods cost more than dehydrated. But the foods don’t shrivel. That means you get 2 to 3 times more dehydrated food out of the same-size container. (But freeze dried does prepare more quickly. Dehydrated still needs to be cooked.)