Diet high in vitamin C decreases stroke risk, especially among smokers

ST. PAUL, MN Eating a diet high in vitamin C may decrease your risk of stroke, particularly if you smoke, according to a study published in the November 11 issue of Neurology, the scientific journal of the American Academy of Neurology.

The study found that people with the lowest amount of vitamin C in their diets were 30 percent more likely to have a stroke than people with the highest amount of vitamin C in their diets. Smokers with diets high in vitamin C were more than 70 percent less likely to have a stroke than smokers with diets low in vitamin C.

Antioxidants such as vitamin C may protect cells from oxidative stress, which plays a role in stroke.

Vitamin E was also protective for smokers. Those with diets high in vitamin E were more than 20 percent less likely to have a stroke than those with diets low in vitamin E. No similar advantage was found in non-smokers whose diets were high in vitamin E.

"Of course these study findings do not justify smoking. No one should smoke," said study author Monique Breteler, MD, PhD, of Erasmus Medical Center in Rotterdam. "But it is good news that high levels of antioxidants may help reduce the risk of stroke in smokers."

The study involved 5,197 people age 55 or older in Rotterdam, the Netherlands. All of the participants had no cognitive problems, were living independently and had never had a stroke.

The participants were then tracked for an average of 6.4 years. During that time, 253 people had strokes.

People with the highest amount of vitamin C in their diets consumed greater than 133 mg of vitamin C per day. People with the lowest amount in their diets consumed less than 95 mg per day.

To determine their levels of vitamin C and other antioxidants, participants first indicated on a checklist all foods and drinks they had consumed at least twice a month during the past year. Then they were interviewed by a dietician about their diet.

The use of diet

Contact: Marilee Reu
American Academy of Neurology

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