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Vitamin C supplementation, carotid atherosclerosis progression linked

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Vitamin C supplementation, carotid atherosclerosis progression linked

Findings are a surprise to researchers, who caution that more studies are needed.

 

April 2000 SAN DIEGO - Although consuming a diet high in vitamin C may have healthy benefits, a regular intake of C supplements may speed up the progression of carotid atherosclerosis. James H. Dwyer, MD, professor, Keck School of Medicine, University of Southern California, said that vitamin C supplements acutely improve vasodilation and blood flow after hyperemia. Evidence concerning long-term effects of chronic vitamin C supplements on mortality and cardiovascular disease, however, are inconsistent. He spoke here at the American Heart Association's (AHA) 40th Annual Conference on Cardiovascular Disease Epidemiology and Prevention. IMT measured The study involved 573 apparently healthy men and women, aged 40 to 60 years. Using high-resolution B-mode ultrasound, researchers determined wall thickness as far wall intima-media thickness (IMT) of the left and right common carotid arteries. Patients reported their vitamin C supplementation use at baseline in a questionnaire, and intake of vitamin C from food was determined by three 24-hour diet recalls. "At 18 months, we found that vitamin C supplementation was a significant positive predictor of IMT progression in age-sex adjusted and cardiovascular risk-factor adjusted models," Dwyer reported. The association was seen in men and women and was dose dependent. After adjusting for vitamin E and multiple vitamin supplements, the strength of the association was not diminished. IMT progression increased by 1.2-, 2.1- and 2.7-fold across the tertiles of vitamin C supplementation (20 mg/day to 190 mg/day; 192 mg/day to 479 mg/day; 480 mg/day to 3,355 mg/day) relative to nonusers of C supplements. "Calcium from food showed a small inverse relation with IMT progression," Dwyer said. Extract components from food "When you extract one component of food and give it at very high levels, you just don't know what you are doing to the system, and it may be adverse," Dwyer said at a news conference. Shiriki K. Kumanyika, PhD, RD, MPH, chair of the AHA's Council for Epidemiology and Prevention, added: "It's a challenge to sort out what it is in what people eat that makes them live longer. We have to be careful about recommending foods or nutrients, because if we are wrong, we can do harm." For more information: Dwyer JH, Nicholson LM, Shircore A, et al. Vitamin C supplement intake and progression of carotid atherosclerosis, the Los Angeles Atherosclerosis Study. #P82. Presented at the American Heart Association's 40th Annual Conference on Cardiovascular Disease Epidemiology and Prevention. March 1-4, 2000. San Diego.

 

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