7. Watercress
Watercress is an aquatic plant from the Brassicaceae family and thus similar to arugula and mustard greens.
It’s said to have healing properties and has been used in herbal medicine for centuries. However, no human studies have confirmed these benefits so far.
Test-tube studies have found watercress extract to be beneficial in targeting cancer stem cells and impairing cancer cell reproduction and invasion (22Trusted Source, 23Trusted Source).
Due to its bitter and slightly spicy flavor, watercress makes a great addition to neutrally flavored foods.