Include foods rich in antioxidants like vitamin C, lycopene, and beta-carotene available in many fruits and vegetables in your diet at least 3-4 times a week. Add superfoods, such as broccoli, tomatoes, strawberries, carrots, and whole grains, to your daily diet. You can also try dark leafy greens like spinach, mustard greens, lettuce, kale, chicory that contain fibre, folate, and carotenoids. These nutrients prevent cancer of various organs, such as the mouth, larynx, pancreas, lung, skin, and stomach.