On the other hand, superfoods like high-fiber fruits and vegetables have powerful components that help stop the development of these diseases. One example of a superfood that help fight cancer is onion.

According to a study published in the journal OncoTargets and Therapy, onions contain flavonoids that can stop the growth of colorectal cancer cells. Flavonoids are naturally occurring plant pigments that have antioxidant and anti-inflammatory activities inside the human body. The study also revealed that the flavonoids in onion extracts are just as effective as the chemotherapy drug capecitabine.

Known for their pungency and strong flavor, onions are widely used in different cuisines. But historical records show that they also have a long history of use in traditional medicine.

In many countries, onions are considered a natural remedy for different kinds of ailments, such as bronchitis, colds, colic, high blood pressure, fevers, sores and impotence. Their widespread use as a folk medicine has attracted the attention of scientists, who have since looked at their potential application in modern medicine.