Eat food rich in Beta Carotene. There is increasing evidence from research that including foods rich in Beta Carotene in your diet may help reduce your risk of certain cancers, particularly lung cancer. Where do you find Beta Carotene? In dark green leafy vegetables like broccoli and spinach. Also carrots, pumpkins and sweet potatoes. Plus fruits, such as peaches, papayas, cantaloupe and similar melons.