Abstract
Purpose
High glycemic load (GL) has been associated with excess stroke risk. Data suggest a different role of diet in the etiology of ischemic and hemorrhagic stroke.
Methods
We analyzed data from 19,824 participants of the Greek cohort of the population-based European Prospective Investigation into Cancer and nutrition (EPIC), who were free of cardiovascular diseases, cancer, and diabetes at baseline and had not developed diabetes. Diet was assessed at enrollment through a validated, interviewer-administered semi-quantitative food frequency questionnaire. The average daily GL was derived using standard tables. We also conducted a meta-analysis on GL and stroke (overall, ischemic and hemorrhagic), using random-effects models.
Results
In the Greek EPIC cohort, 304 incident stroke cases were identified (67 ischemic, 49 hemorrhagic). Using Cox proportional hazards regression models adjusted for potential confounders, the hazard ratios for the highest versus the lowest GL tertiles were 1.07 [95 % confidence interval (CI) 0.74–1.54] for overall stroke, 1.55 (95 % CI 0.72–3.36) for ischemic and 0.48 (95 % CI 0.18–1.25) for hemorrhagic stroke (p-heterogeneity <0.01). The meta-analysis, including a total of 3,088 incident cases and 247 deaths from stroke (1,469 cases and 126 deaths ischemic; 576 cases and 94 deaths hemorrhagic), estimated pooled relative risks for the highest versus the lowest GL levels of 1.23 (95 % CI 1.07–1.41) for overall, 1.35 (95 % CI 1.06–1.72) for ischemic, and 1.09 (95 % CI 0.81–1.47) for hemorrhagic stroke (p-heterogeneity = 0.275).
Conclusions
This study indicates that GL is an important determinant of the more common ischemic—though not of the hemorrhagic—stroke.
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Acknowledgments
The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under CHANCES Project grant agreement no. HEALTH–F3-2010-242244. The work of CLV, MR, and FT was partially supported by the Italian Foundation for Cancer Research (AIRC), Milan, Italy. The authors thank Ms Garimoldi for editorial assistance.
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On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Carlo La Vecchia and Antonia Trichopoulou share senior co-authorship.
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Rossi, M., Turati, F., Lagiou, P. et al. Relation of dietary glycemic load with ischemic and hemorrhagic stroke: a cohort study in Greece and a meta-analysis. Eur J Nutr 54, 215–222 (2015). https://doi.org/10.1007/s00394-014-0702-3
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DOI: https://doi.org/10.1007/s00394-014-0702-3