Cancer Prevention: Whole grain rice like brown rice is rich in insoluble fiber that can protect against many types of cancer. Many scientists and researchers believe that such insoluble fibers are vital for protecting the body against the development and metastasis of cancerous cells. Fiber, specifically is beneficial in defending against colorectal and intestinal cancer. However, besides fiber, rice also has natural antioxidants like vitamin C, vitamin-A, phenolic and flavonoid compounds, which also act as or stimulate antioxidants to scour the body for free radicals. Free radicals are byproducts of cellular metabolism that can do serious damage to your organ systems and cause the mutation of healthy cells into cancerous ones. Boosting your antioxidant levels is a great idea, and eating more rice is a wonderful way to do that.