Hi!
There are scientific evidences for a significant association between cancer protection and the consumption of fruit and vegetables. Fruit and vegetables are rich in vitamins, minerals and other biochemicals, that are playing an important role in body's metabolic processes and are essential for staying in good health and prevention of number of disease, including different types of cancers.
The mechanisms of action of vitamins and other micronutrients in general are numerous, complex and some may function as antioxidants or in DNA repair, others act as antimutagens.
Vitamin C is one of the most potent antioxidant vitamins(antioxidants are preventing cell damage by interacting and stabilizing the free radicals, very reactive molecules that are causing damage to DNA and cell proteins-DNA damage is linked to cancer appearance.) Vitamin C is important for an efficient immune system(first cancer cells that are developed are destroyed by efficient immune system), healthy body tissue and is known that inhibits the formation of some cancerogenic substances.
Vitamin D deficiency causes an increase in cell proliferation, another known risk factor for cancer(uncontrolled proliferation is one of the main cancer cell characteristics.
Omega 3 fatty acids discourage certain cancers from starting and slow progression of some cancers by damping of inflammation (a cause and growth promoter of common cancers).
Folic acid, B6 and B12 vitamins are involved in different parts of DNA repair, thus preventing cancer appearance.
Vitamin E, one of the body’s main antioxidants, is important in cell maintenance and researchers recently suggested that vitamin E potentially slows prostate cancer growth.
There is association between lower risk of many types of cancer and beta carotene(antioxidant).
Lycopene, found in tomatoes, apricots, oranges watermelon, and other foods is very potent antioxidant.
Selenium is a mineral and is a component of antioxidant enzymes.
All of this substances and other more are helping our body to prevent and fight with cancer.
Hope I helped!
Best wishes!
Marija