Table of Contents

Introduction: The Power of Freeze Drying

Have you ever thought how astronauts eat their vegetables in space? Or how hikers get food to mountains without it going bad? Behind the seemingly magical answer, be it freeze dried or another process to change the state of the food item, there is some really fascinating science. So, how does it actually work? And why does it keep products for so long? Let us delve into it.

How does freeze drying work?

Basically, the product, having been frozen, is put under a partial vacuum that extracts nearly all the water from the food, leaving the structure mostly intact. Think of your favourite fruit. The water is sucked out of it. Structure, nutrients and flavour remain. Awesome!

Why Freeze Dried Products have a Longer Shelf Life

Protection against bacteria and microorganisms

Microbes and bacteria are literally everywhere and, if they’re going to have any chance to spoil your food, they’re going to need some moisture. Evaporation of the water content creates a hostile environment for these tiny bugs.

Minimal moisture content

Dry foods can last a long time, dry foods that aren’t routine dried foods. Even regular dried foods absorb some level of moisture, and all levels of moisture mean some sort of expiration date. But almost no moisture at all? This food will last for years without refrigeration.

Nutrient retention

Instead of just being dried, freeze drying foods preserves most of their nutrition – which means not only are they good to eat for longer, they’re still good for you!

Comparing Freeze Drying with Other Preservation Methods

Traditional dehydration

Ever eaten a raisin? That is a dehydrated grape. The raisin lasts longer than the grape, but the shelf-life doesn’t compare to freeze dried products. And the nutrition and flavour are often modified.


The canning of foods generally involves heating it to kill off harmful bacteria before sealing it into its container. It has been proven to work, but high temperature often destroys valuable nutrients from foods.


It is the most common way in which we feed ourselves. But be honest, how many times have you opened your fridge to find a science experiment where leftovers from last week once were? Freeze dried never does that to you.

Benefits of Freeze Dried Foods

Convenience and portability

Heading off to the great outdoors? Pop some freeze dried fruit into your rucksack. No washing required, no peeling necessary and almost no weight at all.

Economic benefits

Don’t accumulate too much, stock up for years to come. No more throwing food out because it stopped being edible.

Reducing food waste

Having longer shelf lives means that consumers can reduce food waste – a win for our wallets and the environment.

Conclusion: The Future of Food Preservation

The long shelf life of freeze dried products is not just a gimmick. It’s a sustainable, economic, convenient and healthy way to consume our favourite foods, so I believe that with the advance of technology the technology will stay closer to us. Who doesn’t want food that will last forever? 369 words.


How long can freeze dried foods last?

With proper storage, they can last up to 25 years or more.

Do freeze dried foods retain their flavor?

Absolutely! Most people find that the taste remains nearly unchanged.

Can I rehydrate freeze dried foods?

Yes, just add water and wait a few minutes.

Are freeze dried foods expensive?

Residual value, as the name suggests, refers to the price when an asset is either abandoned (in the case of vehicles) or at the end of a lease (for buildings or other fixed-location items). Appreciation is the percentage change in the asset’s value, resulting in positive residual value, while depreciation is a percentage decline in an asset’s value, resulting in negative residual value. So although the initial purchase is more expensive, the incredibly long residual value often makes it worth the cost in the long run.

Where can I buy freeze dried products?

Most outdoor or camping stores, online retailers, and even some supermarkets stock them.

Leave a Reply

Your email address will not be published. Required fields are marked *