Blueberries offer an excellent source of flavonoids, especially anthocyanidins. Anthocyanidins are antioxidant compounds that are responsible for the blue, purple, and red pigments of blueberries. They are also a very good source of soluble fiber, insoluble fiber (such as pectin), vitamin C, manganese, and riboflavin.
Research found that blueberries have the highest antioxidant capability. Antioxidants may also be effective in the protection against alzheimer’s disease. Research has shown that blueberries help to protect the brain from oxidative stress and may reduce the effects of age related conditions, such as alzheimer’s disease.
The most popular medical use of blueberries today is for improvement of vision and for the protection against age-related macular degeneration. Blueberries have also been very effective as a remedy for both diarrhea and constipation. Along with soluble and insoluble fiber, blueberries also contain tannins. Tannins act as astringents in the digestive system and work to firm up a loose stool. Since blueberries contain the same compounds that are found in cranberries they are also effective in promoting urinary tract health.