Learn about freeze drying

Use this guide to learn about the origins of freeze drying, what freeze drying is, and how it preserves food. Learn how it has changed with technology. Understand the advantages and disadvantages of freeze drying and how to make the best decisions if you choose to invest in freeze-dried foods.

What is it?

Learn how the freeze-drying process removes water. Learn more about each stage of the process: Pretreatment, Freezing, and Drying (Primary Drying and Desorption). Learn what happens during each stage.

How does it preserve food?

Learn how freeze-dried food last longer. Also learn how long it can last.

The science

Learn about sublimation and the physical changes that happen during the freeze-drying process. Learn more about the freeze-drying stages and the potential moisture composition of the final products.

The history

Learn about the first recorded origins of freeze drying. Learn what types of food were first freeze dried and what made freeze drying possible many years ago.

How it’s done

Learn the methods that can be used to freeze dry. Learn about where it happens naturally, and how freeze drying has been used.

Advantages & Disadvantages

Freeze drying is a great way to preserve food. It can also make some great snacks. But you should also understand the possible drawbacks.

What to avoid

Not everything can be freeze dried. Some food items can be complicated to freeze dry. You need to consider food thickness and salt or sugar levels.

The economics

Freeze-dried food can provide great personal security against emergencies. Before you invest in it, you should understand the options and how they compare.


Some freeze-dried food is great to eat as-is. Other foods or ingredients should be reconstituted or rehydrated.

Other things people freeze dry

Food items aren’t the only things people freeze dry. There are benefits to removing the moisture from many other things.

Freeze drying vs dehydrating

Freeze drying and dehydrating are both effect ways to preserve food.