Taking dietary supplements full of antioxidants could actually help cancerous tumors grow
Taking vitamins or dietary supplements could be feeding tumors and promote their growth, scientists warn. Common antioxidants, such as vitamins A, C, selenium, and zinc, can stimulate the growth of blood vessels in cancer when taken in excess. This discovery surprised researchers, as prior studies have shown antioxidants to be protective. While Swedish scientists state that natural levels of antioxidants in food are safe, taking supplements containing additional antioxidants could fuel tumor growth and allow the disease to spread faster.
The study, conducted by a team at the Karolinska Institutet, concludes that vitamin C and other antioxidants promote the formation of new blood vessels within lung cancer tumors. Study authors suggest that this finding could be applicable to all cancers and their spread.
“We’ve found that antioxidants activate a mechanism that causes cancer tumors to form new blood vessels, which is surprising, since it was previously thought that antioxidants have a protective effect,” says study leader Martin Bergö, professor at the Department of Biosciences and Nutrition and vice president of the Karolinska Institutet in Sweden. “The new blood vessels nourish the tumors and can help them grow and spread.”
