5. Beta-carotene

This compound is available in foods such as carrots, apricots, broccoli, asparagus, grapefruit, chives, kale, onions, and sweet potatoes. It acts as an antioxidant and slows cancer cell growth by protecting the cell membranes. This compound may protect against cervical, breast, mouth, pharynx and larynx, esophagus, and stomach cancers.