Zinc helps to keep the immune system functioning efficiently to fight cancer and other diseases. It also helps activate certain antioxidants in the body. A 2017 study in The American Journal of Clinical Nutrition showed that just a modest increase in dietary zinc helped replenish antioxidants and restore immune functions in the body. It increased the level of proteins involved in DNA repair and reduced the kind of DNA damage that can lead to cancers.
You can find high amount of zinc in shellfish and legumes such as chickpeas, lentils, and black beans.