Relation of Consumption of Vitamin E, Vitamin C, and Carotenoids to Risk for Stroke among Men in the United States

Relation of Consumption of Vitamin E, Vitamin C, and Carotenoids to Risk for Stroke among Men in the United States

Alberto Ascherio, MD, DrPH;
Eric B. Rimm, ScD;
Miguel A. Hernán, MD, MPH;
Edward Giovannucci, MD, ScD;
Ichiro Kawachi, MD, DrPH;
Meir J. Stampfer, MD, DrPH; and
Walter C. Willett, MD, DrPH

From Harvard School of Public Health, Harvard Medical School, and Brigham and Women's Hospital, Boston, Massachusetts.

Abstract

Background: Antioxidants increase the resistance of low-density lipoprotein to oxidation and may thereby reduce risk for atherosclerosis.

Objective: To determine whether intake of vitamin E, vitamin C, or carotenoids predict risk for total or ischemic stroke.

Design: Prospective observational study.

Setting: The Health Professionals Follow-up Study.

Participants: 43 738 men 40 to 75 years of age who did not have cardiovascular disease or diabetes.

Measurements: Repeated and validated dietary assessments were done by using a self-administered 131-item food-frequency questionnaire, which included questions on dose and duration of vitamin supplement use. The follow-up period was 8 years.

Results: A total of 328 strokes occurred: 210 ischemic, 70 hemorrhagic, and 48 unclassified. After adjustment for age, smoking, hypertension, hypercholesterolemia, body mass index, physical activity, parental history of myocardial infarction, alcohol consumption, and total energy intake, the relative risk for ischemic stroke in the top quintile of vitamin E intake (median, 411 IU/d) compared with the bottom quintile (5.4 IU/d) was 1.18 (95% CI, 0.77 to 1.82). The relative risk for ischemic stroke in the top quintile of vitamin C intake (1167 mg/d) compared with the bottom quintile (95 mg/d) was 1.03 (CI, 0.66 to 1.59). Results for total stroke were similar. Associations of vitamin intake with hemorrhagic stroke were also nonsignificant, but the CIs were wide. Neither dose nor duration of vitamin E or vitamin C supplement use was related to risk for total or ischemic stroke. The relative risk for ischemic stroke was 1.16 (CI, 0.81 to 1.67) in men using 250 IU or more of vitamin E supplementation per day compared with men who used no vitamin E supplements and was 0.93 (CI, 0.60 to 1.45) in men using 700 mg or more of vitamin C supplementation per day compared with men who used no vitamin C supplements. A significant inverse relation between lutein intake and risk for ischemic stroke was seen but was not independent of other dietary factors.

Conclusions: Vitamin E and vitamin C supplements and specific carotenoids did not seem to substantially reduce risk for stroke in this cohort. Modest effects, however, cannot be excluded.

Article and Author Information

Acknowledgments: The authors thank the participants of the Health Professionals Follow-up Study. They also thank Al Wing, Mira Kaufman, Karen Corsano, and Steve Stuart for computer assistance; Jill Arnold, Betsy Frost-Hawes, Kerry Demers, and Mitzi Wolff for assistance with compilation of data and manuscript preparation; and Laura Sampson and Helaine Rockett for maintaining food composition tables.
Grant Support: In part by research grants HL 35464 and CA 55075 from the National Institutes of Health. Dr. Kawachi is supported by a Career Development Award from the National Heart, Lung, and Blood Institute.
Requests for Reprints: Alberto Ascherio, MD, Department of Nutrition, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115; e-mail, alberto.ascherio{at}channing.harvard.edu.
Current Author Addresses: Drs. Ascherio, Hernán, Rimm, and Willett: Department of Nutrition, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115.
Drs. Giovannucci and Stampfer: Channing Laboratory, Department of Medicine, Harvard Medical School and Brigham and Women's Hospital, 181 Longwood Avenue, Boston, MA 02115.
Dr. Kawachi: Department of Health and Social Behavior, Harvard School of Public Health, 677 Huntington Avenue, Boston, MA 02115.