Blueberries

Mmm..blueberries! They are so delicious and healthy that you definitely need to consume them as often as possible, either raw as a snack or in smoothies combined with other fruits of your choice.

Anthocyanin, a kind of flavonoid found in blueberries, has antioxidant characteristics that can strengthen one’s immune system. According to medical professionals, flavonoids are crucial to the immunological defense mechanism of the respiratory tract.

Researchers discovered that those who consumed foods high in flavonoids had a lower risk of developing a respiratory infection of the upper respiratory tract, or the flu, than those who did not.