It turns out that lycopene is a major antioxidant and may protect against other forms of cancer as well. 17 Several Japanese cell-culture and animal studies also have revealed that lycopene can inhibit the growth of cancers. Not surprisingly, a mix of natural carotenoids, similar to what is in a diet rich in fruits and vegetables, may offer the greatest health benefits. Carotenoids are found in all fruits and vegetables. A well-rounded selection might include broccoli, carrots, citrus fruits, red and yellow peppers, spinach, sweet potatoes and tomatoes.
Diversity is really the key here.
Unfortunately, most Americans eat few fruits and vegetables, and when they do, the choices are generally very limited. There's also compelling evidence that the carotenoids work best with other antioxidants, and not just to reduce lung cancer risk. In a study at the University of Nebraska, Lincoln, Judy A. Driskell, Ph.D., fed rabbits a high-cholesterol diet. She gave some of the rabbits beta-carotene, vitamin E, or both. 22 Taken together, the combination both lowered cholesterol and prevented its oxidation.