Saturated fat, vitamin C and smoking predict long-term population all-cause mortality rates in the Seven Countries Study

Background The Seven Countries Study has shown that population mortality ra tes for various chronic diseases are related to diet and smoking. This pape r addresses the associations between diet, smoking and 25-year all-cause mo rtality. Methods Baseline surveys were carried out between 1958 and 1964 on 12 763 m iddle-aged men constituting 16 cohorts in seven countries. In 1987/88 equiv alent food composites representing the average food intake of each cohort a t baseline were collected and chemically analysed in one central laboratory . During 25 years of follow-up 5973 men died and age-adjusted population mo rtality rates were calculated for each cohort. Results Multivariate linear regression analyses showed that the population intake of saturated fat and the prevalence of smoking were positively assoc iated with population all-cause mortality rates. Population vitamin C intak e was inversely associated with all-cause mortality. It was calculated that a reduction in saturated fat intake of 5% of energy, a 20 mg/d increase in vitamin C and a 10% decrease in the prevalence of smokers may decrease the 25-year all-cause population mortality rate by 12.4% (95% CI : 5.6, 19.4%) at an average population all-cause mortality rate of 45%. Conclusion At the population level saturated fat, vitamin C and cigarette s moking are important determinants of all-cause mortality.