Freezer burn is dehydration, and packaging is the whole answer

There is a short answer about freezer burn and a useful one, and they are not the same. What follows is the useful one.

What is actually happening

Ice inside frozen food can pass directly from solid to vapour without ever becoming liquid, which is why food dries out in a freezer. That vapour moves to the coldest available surface, which is usually the inside of the packaging or the freezer wall. The area it left behind is dehydrated, which is what produces the pale, dry, slightly leathery patches.

The same process explains the frost that builds up inside a bag around food that has been stored a long time. It is driven by temperature variation, so a freezer opened frequently or running unevenly accelerates the whole thing.

It is quality, not safety

Food that has dried out this way remains frozen and is generally still safe, since nothing has grown on it. What has been lost is texture and flavour, and the affected part tends to be dry and unpleasant regardless of how it is cooked. Trimming the affected area is usually enough where the rest of the item is unaffected.

Any question about whether a particular frozen item is still fit to eat should be settled by local food safety guidance rather than by appearance alone. The important point is that preventing it is entirely a matter of packaging and temperature stability.

Air space is the enemy

Moisture cannot leave the food if there is nowhere for it to go, which is why tightly wrapped food burns far less. A bag pressed flat and sealed with the air expelled leaves very little space for vapour to accumulate. Rigid containers should be filled near to the top, with a small allowance for expansion, rather than left half empty.

If you are short of time, pressing film directly onto the surface of the food inside a container removes the air gap where the shape prevents flattening. Double wrapping is worth the effort for anything staying in the freezer for more than a few weeks.

Temperature stability matters as much

Every time the freezer warms slightly and cools again, some ice sublimates and refreezes elsewhere. A freezer opened constantly, or one packed so full that the door does not seal, cycles far more than a stable one.

Items stored in the door experience the largest swings and suffer the most. A freezer that is reasonably full holds its temperature better, since the frozen contents act as thermal mass.

Keeping the appliance at the temperature its manufacturer specifies is the baseline, and a freezer thermometer confirms it cheaply.

Which foods suffer most

Lean items with little fat and a large exposed surface dry out fastest, which is why some cuts fare worse than others. Anything with an irregular shape has more surface area and more places for the wrapping to sit loosely. Bread and baked goods dry quickly and are best wrapped closely and used within a shorter window.

At the stove, items in a liquid or sauce are largely protected, since the liquid freezes around them and provides a barrier. That last point is a useful trick, since freezing something submerged in its own liquid solves the problem entirely.

A workable freezer routine

Wrap closely, expel the air, label with the date, and store flat so packages stack rather than sitting loosely. Use older items first, which requires knowing what is there and therefore requires the labels to exist. Check occasionally for packages that have loosened, since a bag that has come open will burn quickly.

In practice, defrosting the appliance when frost builds up restores its efficiency and removes the ice that has left your food. None of this is difficult, and it is the difference between a freezer that preserves food and one that slowly ruins it.

The takeaway

Squeeze the air out, wrap it twice for long storage, label the date, and stop opening the door quite so often.

The good version is the one you can make on a Wednesday.