Frozen blueberries may edge out fresh on key nutrients, experts say

Flash-frozen blueberries may preserve antioxidants and vitamin C more effectively than fresh fruit traveling extended supply chains, health experts indicated in a report by The Korea Times.

The findings complicate the assumption that fresh produce is always nutritionally superior, pointing consumers toward label-reading habits that can affect the actual health benefit of frozen options.

Blueberries owe much of their nutritional reputation to anthocyanins, a class of antioxidants that give the fruit its deep blue-purple color. Their thin skins, however, make them prone to relatively quick deterioration after harvest, raising questions about how much nutritional value survives lengthy storage and transit.

Flash-freezing addresses that gap. Frozen blueberries are typically processed shortly after harvest, limiting the oxidation and vitamin loss that accumulates over days or weeks of transport. Several studies have found frozen fruits and vegetables retain vitamin C and antioxidant levels more effectively than fresh produce subject to extended transportation and storage, according to The Korea Times, citing the South Korean health and medical portal Kormedi.com.

The physical effects of freezing may also improve nutrient availability. When blueberry cell walls break down during the freeze-thaw cycle, anthocyanins become more accessible to the body — a property that has made frozen blueberries a favored ingredient in smoothies and blended preparations.

"Frozen blueberries should not automatically be considered healthier than fresh ones," health experts said, according to the Korea Times report. Nutritional outcomes depend on when and under what conditions each product was harvested, handled and stored — variables that can favor either form depending on the supply chain.

Consumers shopping for frozen blueberries are advised to check ingredient labels carefully. Some commercially available products contain added syrups or sweeteners that can reduce the fruit's natural nutritional benefits; nutrition experts recommend choosing unsweetened varieties.