Cysteine could potentially lower the risk of stroke through antihypertensive and antioxidant effects. Our aim was to evaluate the hypothesis that cysteine intake is inversely associated with stroke incidence.

We used data from the Swedish Mammography Cohort, a population-based prospective cohort of 34 250 women who were free of cardiovascular disease and cancer and had completed a food-frequency questionnaire about diet and other risk factors for stroke in the autumn of 1997. Stroke cases were identified by linkage of the study population with the Swedish Inpatient Register and the Swedish Cause of Death Register. Relative risks (RR) with 95% confidence intervals, adjusted for potential confounders, were estimated by using Cox proportional hazards regression model.

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