Brown rice helps to prevent cancer because it contains higher levels of fiber, vitamins, and minerals compared to white rice. It also contains antioxidants, such as selenium and phenolic compounds, which have been shown to have anti-cancer properties. Additionally, the bran layer of brown rice contains phytochemicals, such as lignans and phytic acid, which have been linked to a reduced risk of certain types of cancer, including colon and breast cancer. Therefore, incorporating brown rice into the diet can be beneficial in reducing the risk of cancer.