We examined the association between chocolate consumption and risk of stroke in the population-based Swedish Mammography Cohort. In the autumn of 1997, 39,227 women completed a questionnaire that included approximately 350 items concerning diet and other lifestyle factors (4). We excluded women with a missing national identification number, those with implausible values for total energy intake, and those with a history of cancer, stroke, coronary heart disease, or diabetes mellitus before baseline. That left 33,372 women, age 49 to 83 years, for analysis. The study was approved by the Ethical Review Board at the Karolinska Institutet (Stockholm, Sweden). Chocolate consumption was assessed using a self-administered food-frequency questionnaire. Women were asked to indicate how often on average they had consumed chocolate and 95 other foods during the previous year. There were 8 pre-defined consumption categories ranging from never to ≥3 times a day. In the 1990s, approximately 90% of chocolate consumption in Sweden was milk chocolate, containing approximately 30% cocoa solids (5). The food-frequency questionnaire has been validated, and the Spearman correlation coefficient between chocolate intake estimated from the questionnaire and the intake estimated from 28 days of weighted diet records (4 1-week records completed approximately 3 months apart) was 0.4 (A. Wolk, unpublished data, 1992).