Click Here
ad - Click Here Now! - Click Here Now!

Video of the Day
Mush! Schools offer lessons for hardy first-timers who want to experience sled dog travel.

Watch more CNN VIDEO
  health AIDS Aging Alternative Medicine Cancer Children Diet & Fitness Men Women
  myCNN | Video | Audio | Headline News Brief | Free E-mail | Feedback  




Study links vitamin C pills with faster clogging of the arteries

Bottoms up for health? Guidelines for alcohol consumption remain controversial

Georgetown Medical faces class action lawsuit for exposing patients to diseases -- with warnings - March 2, 2000

Russian HIV cases surge, more than 30,000 infected

Gene therapy successful in treating hemophilia B, researchers say

FDA halts trials of heart disease gene therapy



Third person dies from Pittsburgh-area shooting spree

Stakes are high for Bush and McCain in Los Angeles debate

Pinochet freed, leaves London for Chile

Expelled Cuban envoy returns to Havana

4:30pm ET, 3/2


 All Scoreboards

Enter your U.S. Zip:

Click here for U.S. States or world cities









 diet & fitness

CNN Websites
Networks image


Study links vitamin C pills with faster clogging of the arteries


March 2, 2000
Web posted at: 6:35 p.m. EST (2335 GMT)

SAN DIEGO (AP) -- A new study raises the disturbing possibility that taking vitamin C pills may speed up hardening of the arteries.

Researchers called their discovery a surprise and cautioned that more experiments are needed to know for sure whether megadoses of the vitamin actually are harmful.

Still, they said the finding supports the recommendations of health organizations, which generally urge people to avoid high doses of supplements and to get their nutrients from food instead.

Many people load up on vitamin C and other nutrients on the assumption that these supplements are good for their health, even though there is little scientific evidence this is true. In theory, vitamin C and some other nutrients might protect the circulatory system and other organs by suppressing the damaging effects of oxygen.

"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," said Dr. James H. Dwyer, an epidemiologist who directed the study. He presented the findings Thursday at a meeting in San Diego of the American Heart Association.

Dwyer and colleagues from the University of Southern California studied 573 outwardly healthy middle-aged men and women who work for an electric utility in Los Angeles. About 30 percent of them regularly took various vitamins.

The study found no clear-cut sign that getting lots of vitamin C from food or a daily multivitamin does any harm. But those taking vitamin C pills had accelerated thickening of the walls of the big arteries in their necks. In fact, the more they took, the faster the buildup.

People taking 500 milligrams of vitamin C daily for at least a year had a 2 1/2 times greater rate of thickening than did those who avoided supplements. Among smokers, the rate was five times greater.

"If a person's physician has prescribed vitamin C, it is appropriate to be taking it," Dwyer said. "But if you are a healthy person and taking them in hopes of preventing cardiovascular disease, the heart association does not recommend it. This study would suggest that recommendation is prudent."

Dr. Shiriki Kumanyika of the University of Pennsylvania said the research shows the uncertainties of picking out a single vitamin among the plethora of nutrients in a healthy diet.

"It's a challenge to sort out what it is in what people eat that makes them live longer," she said. "We have to be careful about recommending foods or nutrients, because if we are wrong, we can do harm."

In general, experts recommend that people get their vitamins and other nutrients from fruits, vegetables, whole grains and nuts.

Clogged arteries -- what doctors call atherosclerosis -- are the major underlying cause of heart attacks and strokes.

In the latest study, doctors looked for early signs of this process by twice performing ultrasound scans on the volunteers' carotid arteries, once at the study's start and again 18 months later.

Copyright 2000 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Vitamins: The ABCs of nutrition
Stressed out? Vitamin C is possibly the perfect chill pill
Double the vitamin C, NIH says

NIH Office of Dietary Supplements
Note: Pages will open in a new browser window
External sites are not endorsed by CNN Interactive.


Back to the top   © 2000 Cable News Network. All Rights Reserved.
Terms under which this service is provided to you.
Read our privacy guidelines.