By Gary Null Ph.D.
Editor's comment: Following critical reports of the lack of benefit of beta-carotene in preventing lung cancer in smokers, it is appropriate to review this nutrient's scientific literature. While some past studies may have indicated an association between synthetic beta-carotene supplements and lung cancer risk in smokers, an extensive international study in the January 2004 issue of Cancer Epidemiology Biomarkers and Prevention concludes that, when consumed as part of whole foods, beta-carotene poses no such risk.
In the past decade, beta-carotene has gained tremendous stature in the nutritional world. This carotenoid, which gives many fruits and vegetables their yellow pigmentation, has always played an important role in health because it becomes vitamin A in the body. But in recent years, researchers have discovered that beta-carotene not only functions as a precursor to vitamin A but also works on its own to maintain health. Unlike vitamin A, which as limited antioxidant properties, beta-carotene is among the most powerful of antioxidant nutrients. As such, it can help to guard against the development of cancer.
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