This time no beta-carotene in vegetables that has the spotlight, but rather its cousin: alpha-carotene. Both are members of the carotenoid antioxidant family. Scientists trust carotenoid antioxidants promote health by counteracting oxygen-related damage to DNA.

Consumption of fruits and vegetables has long been associated with lower risks of health troubles such as cancer and heart disease, said Dr. Chaoyang Li of the U.S. Centers for Disease Control and Prevention, in Atlanta, in e-mail to Reuters Health.

However, it is still not understandable which elements contribute to the health effects or how they do so, he added, pointing to recent studies that have found no apparent benefit for beta-carotene supplements.

To investigate the merits of oft-ignored alpha-carotene, Li and his colleagues analyzed information on more than 15,000 people who were participating in the Third Nationwide Health and Nutrition Examination Survey Follow-up Study. All of them provided blood samples at the start of the study, along with other medical and lifestyle information.



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