It's a common belief that fruit should be eaten fresh; once processed, its nutrients are largely gone. This view is actually a bit one-sided! Especially with freeze-dried fruit, many people may think it's just a waste of money, but that's not the case.
The Freeze-Dried Fruit Production Process
Freeze-dried fruit is produced using a process called "vacuum freeze-drying." Simply put, the fruit is first frozen to -30 to -40 degrees Celsius, creating a layer of tiny ice crystals throughout the food. These ice crystals then transform into water vapor at this low temperature, drying the food over dozens of hours. Because the ice crystals transform directly into vapor, the food is left with numerous air spaces, resulting in a crispy texture.
However, freeze-dried fruit also has a drawback: it oxidizes if left at room temperature for extended periods, so it should be consumed quickly after opening. However, vacuum drying eliminates the problem of many nutrients and antioxidants being easily oxidized during processing. Low-temperature freezing also prevents some vitamins and phytochemicals from being sensitive to heat. Because they're not cooked, there's no loss of water-soluble healthful ingredients like vitamin C, various B vitamins, and anthocyanins, flavonoids, and chlorogenic acid.
Low-Temperature Fried Fruit and Vegetable Chips vs. Freeze-Dried Fruit
Some people may confuse freeze-dried fruit with low-temperature fried fruit and vegetable chips. Low-temperature fried fruit and vegetable chips are produced by frying them in a vacuum. While this low-temperature frying method can reduce the oxidative polymerization of oils, prevent the formation of carcinogens like benzopyrene, and preserve the original color and aroma of fruits and vegetables, it still involves elevated temperatures, which inevitably leads to vitamin loss. Furthermore, low-temperature frying increases the fat content of fruits and vegetables. Nutrition Facts Comparison
Each package (average 43g) contains:
Energy: 2301 kilojoules (kJ) - 27% of the NRV
Fat: 6.7g - 58% of the NRV
Protein: 989kJ - 14.9% of the NRV
Saturated Fat: 109% - 55.7% of the NRV
Carbohydrates: 83mg - 19% of the NRV
Sodium: 4% - 4% of the NRV
In contrast, the nutritional information on freeze-dried fruit will indicate its high nutrient density. If you see "vegetable oil" in the ingredient list, or if the fat content is high in the Nutrition Facts, it's definitely not freeze-dried fruit, but rather a product that has been deep-fried. Also, check the ingredient list for any sugars and sweeteners. Unless particularly tart fruits (such as sea buckthorn, prickly pear, lemon, and cranberry) require a little sugar for flavoring, freeze-dried fruit should ideally only list "a specific fruit" as an ingredient. This type of product has the highest nutrient density.
Purchasing Tips
If you're looking to buy freeze-dried fruit, check the ingredient list and nutritional information. For example, a certain brand's "Non-Destructive Fruit and Vegetable Selection" includes strawberries, mangoes, apples, and other ingredients, sourced from Shandong and Fujian. It's recommended for immediate consumption. The packaging is individually bagged, 25g per bag, and comes in three bags. The shelf life is 12 months.
So, next time, don't underestimate freeze-dried fruit! It's actually a very healthy choice!
