Blueberries, especially wild species, contain anthocyanins, other antioxidant pigments and other phytochemicals which may have a role in reducing the risks of some diseases, including cancers.
Researchers have shown that blueberry anthocyanins, proanthocyanidins, flavonols and tannins inhibit mechanisms of cancer cell development in vitro. At a 2007 symposium on berry health benefits were reports showing consumption of blueberries (and similar fruits including cranberries) may alleviate the cognitive decline occurring in Alzheimer's Disease and other conditions of aging.