If you see ice crystals on frozen food, this is what it really means

I asked experts how to tell when food is safe to eat—and when it’s time to toss it.

The freezer is my go-to partner for meal prep solution. I love that I can cook something, let it cool, and then store it in the freezer to be used days, weeks, or even months later.

While most of the time freezing seems foolproof, there are instances when I reach into the freezer for something and find it covered in ice crystals. Does that mean my frozen food is going to taste off? Even worse, do the ice crystals mean my food is no longer safe to eat?

What Are Ice Crystals—and Why Are They on My Food?

Freezing is a trusted technique for food preservation, but it isn’t flawless. Variables, like the water content of food, the method used to freeze food, and the temperature of the freezer, can interfere with success. The most irritating issue: ice crystals, aka freezer burn.

Registered dietician Christy Wilson, who focuses on cooking for the family, explains that when food is frozen, the water inside it turns into ice. If the freezing happens quickly, small ice crystals form, which have minimal effect on the quality of the food. However, if food is frozen slowly, then larger, rougher, more detectable ice crystals form.

Shifts in temperature can cause ice crystals to form, too. Temperature change can come from opening and closing the freezer door. But it also happens when a freezer does not hold a steady temperature. Slight changes in temperature will cause moisture to shift from inside the cell structure to the surface of foods.  This can result in a buildup of ice crystals over time. Similarly, frost can form on foods and packaging in the freezer when moisture in the air freezes and forms ice crystals.

Are Ice Crystals Safe to Eat?

The presence of ice crystals is an indicator of compromised quality and texture of the food, not safety. So, rest assured, you can safely eat food covered in ice crystals, but there may be some changes to taste and texture.

Even the best packaged frozen foods have some degree of ice crystallization. When ice crystals form in frozen foods that are meant to be cooked before eating, the tiny amount of surface ice rarely has a noticeable effect on quality after cooking. That’s because the heat melts the ice and restores much of the food’s original texture. (Especially when you follow the on-package cooking instructions for thawing and preparing.)

However, “for foods that are eaten while still frozen, such as ice cream, even a small amount of ice crystal formation can noticeably degrade texture,” she adds. Wilson explains that from a scientific standpoint, moisture migrates out of the food matrix, forming larger ice crystals and leaving behind a less stable structure. Unlike cooked foods, there is no reheating step to reintegrate the melted ice, compromising the texture.

Bottom line, the ice crystals present on frozen food are safe to consume, but their presence can indicate that the texture and quality are compromised. If you don’t mind your peas on the softer side, go ahead and reheat and enjoy.

Tips for Preventing Ice Crystals

Author: Dennis Hickey

There are no limits to success to those who never stop learning. Learning will nourish your personal growth. I hope you enjoy this website and visit often so you too keep learning too. View all posts by Dennis Hickey