This white frost on the blueberries doesnt need to be washed off deliberately!

Since March, blueberries in China have gradually entered their peak season, with prices dropping significantly. From tens of yuan per small box to increasingly affordable prices, blueberries are becoming a common daily fruit choice for many households. However, as consumption rises, numerous questions about blueberries have emerged: What is the "white frost" on the surface of blueberries? Why do fresh blueberries spoil quickly in the refrigerator after purchase? How should blueberries be stored?

"White frost" is a naturally formed protective layer on blueberries

Wu Jia, Deputy Secretary-General of the Nutrition Literacy Branch of the China Health Promotion Association, explained that the "white frost" on the surface of blueberries is a natural protective layer formed by the fruit, essentially composed of sugar alcohols. It helps reduce water evaporation and resist microbial invasion. "Uniform white frost is actually a sign of fresh blueberries and does not need to be deliberately washed off, let alone scrubbed vigorously. Excessive cleaning can damage the skin, making the blueberries more prone to spoilage," Wu Jia stated.

How to Select and Store Blueberries?

Blueberries have high water content and thin skins, so they can quickly soften or even spoil if stored improperly. Wu Jia suggests that consumers should focus on the following three aspects when purchasing blueberries: first, the fruit should have intact appearance, clean stems, and no mold spots or fluffy substances; second, they should feel firm and elastic without softness or collapse; third, they should emit a mild fruity aroma. If an alcoholic or rancid odor is detected, it indicates the fruit has begun to spoil.

To store blueberries, it is recommended to place them in a breathable container and refrigerate at a temperature of 0~4°C, consuming them within a week is more suitable. "Special attention should be paid to avoid storing them together with fruits like apples and bananas that release ethylene, as this can accelerate the ripening and spoilage of blueberries," said Wu Jia.

Consume directly and control intake

Wu Jia stated that from a nutritional perspective, the most recommended way to consume blueberries is to eat them directly. This is because the anthocyanins and vitamin C in blueberries are relatively heat-sensitive, and some may be lost when processed into jam or cooked at high temperatures. Pairing them with yogurt or oatmeal can not only enhance the taste but also better balance the dietary structure.

Even the healthiest foods are not always better in larger quantities. Wu Jia suggests that adults should consume 100 to 150 grams of blueberries daily. Eating too much at once may cause diarrhea or gastrointestinal discomfort. For individuals with poor blood sugar control, its also important to monitor the total intake and distribute it appropriately within the daily fruit consumption.