We have evaluated the effects on mortality of habitual low carbohydrate–high-protein diets that are thought to contribute to weight control.
Adult Greek population.
Follow-up was performed from 1993 to 2003 in the context of the Greek component of the European Prospective Investigation into Cancer and nutrition. Participants were 22 944 healthy adults, whose diet was assessed through a validated questionnaire. Participants were distributed by increasing deciles according to protein intake or carbohydrate intake, as well as by an additive score generated by increasing decile intake of protein and decreasing decile intake of carbohydrates. Proportional hazards regression was used to assess the relation between high protein, high carbohydrate and the low carbohydrate–high protein score on the one hand and mortality on the other.
During 113 230 persons years of follow-up, there were 455 deaths. In models with energy adjustment, higher intake of carbohydrates was associated with significant reduction of total mortality, whereas higher intake of protein was associated with nonsignificant increase of total mortality (per decile, mortality ratios 0.94 with 95% CI 0.89 –0.99, and 1.02 with 95% CI 0.98 –1.07 respectively). Even more predictive of higher mortality were high values of the additive low carbohydrate–high protein score (per 5 units, mortality ratio 1.22 with 95% CI 1.09 –to 1.36). Positive associations of this score were noted with respect to both cardiovascular and cancer mortality.
Prolonged consumption of diets low in carbohydrates and high in protein is associated with an increase in total mortality.
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This work was supported by the Europe Against Cancer Program of the European Commission, the Greek Ministry of Health, the Greek Ministry of Education, and an unrestricted grant to the University of Athens in honour of ‘Vasilios and Nafsika Tricha’ (all supporting the collection and management of the data).
Guarantor: A Trichopoulou.
Contributors: AT is the principal investigator of the Greek EPIC project and has the supervising responsibility for all aspects of this project. TP is the physician directly involved in the implementation of this study. PO is the coordinator for data analysis. C-CH and DT are the epidemiology consultants.
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Trichopoulou, A., Psaltopoulou, T., Orfanos, P. et al. Low-carbohydrate–high-protein diet and long-term survival in a general population cohort. Eur J Clin Nutr 61, 575–581 (2007). https://doi.org/10.1038/sj.ejcn.1602557
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