Author:
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Abbas, Sascha; Linseisen, Jakob; Rohrmann, Sabine; Beulens, Joline W. J.; Buijsse, Brian; Amiano, Pilar; Ardanaz, Eva; Balkau, Beverley; Boeing, Heiner; Clavel-Chapelon, Françoise; Fagherazzi, Guy; Franks, Paul W.; Gavrila, Diana; Grioni, Sara; Kaaks, Rudolf; Key, Timothy J.; Khaw, Kay-Tee; Kühn, Tilman; Mattiello, Amalia; Molina Montes, Esther; Nilsson, Peter M.; Overvad, Kim; Quirós, J. Ramón; Rolandsson, Olov; Sacerdote, Carlotta; Saieva, Calogero; Slimani, Nadia; Sluijs, Ivonne; Spijkerman, Annemieke M. W.; Tjønneland, Anne; Tumino, Rosario; van der A, Daphne L.; Zamora-Ros, Raul; Sharp, Stephen J.; Langenberg, Claudia; Forouhi, Nita G.; Riboli, Elio; Wareham, Nicholas J.
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Abstract:
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BACKGROUND/OBJECTIVES: Prospective cohort studies have indicated that serum vitamin D levels are inversely related to risk of type 2 diabetes. However, such studies cannot determine the source of vitamin D. Therefore, we examined the association of dietary vitamin D intake with incident type 2 diabetes within the European Prospective Investigation into Cancer and Nutrition (EPIC)-InterAct study in a heterogeneous European population including eight countries with large geographical variation. SUBJECTS/METHODS: Using a case-cohort design, 11 245 incident cases of type 2 diabetes and a representative subcohort (N = 15 798) were included in the analyses. Hazard ratios (HR) and 95% confidence intervals (CIs) for type 2 diabetes were calculated using a Prentice-weighted Cox regression adjusted for potential confounders. Twenty-four-hour diet-recall data from a subsample (N = 2347) were used to calibrate habitual intake data derived from dietary questionnaires. RESULTS: Median follow-up time was 10.8 years. Dietary vitamin D intake was not significantly associated with the risk of type 2 diabetes. HR and 95% CIs for the highest compared to the lowest quintile of uncalibrated vitamin D intake was 1.09 (0.97-1.22) (P-trend = 0.17). No associations were observed in a sex-specific analysis. The overall pooled effect (HR (95% CI)) using the continuous calibrated variable was 1.00 (0.97-1.03) per increase of 1 mg/day dietary vitamin D. CONCLUSIONS: This observational study does not support an association between higher dietary vitamin D intake and type 2 diabetes incidence. This result has to be interpreted in light of the limited contribution of dietary vitamin D on the overall vitamin D status of a person. |