Prevention of Coronary Heart Disease: Diet, Lifestyle and Risk Factors in the Seven Countries Study

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The Seven Countries Study was the first to establish credible data on incidence and death rates of CHD in contrasting cultures. The study documented population differences in average levels and distributions of coronary risk factors. It also demonstrated large differences in composition of the diet in otherwise similar, stable, rural agricultural or pastoral populations. Diet and cigarette smoking explained most of the differences in population CHD rates, while changes in serum cholesterol and blood pressure levels between entry and 25-year follow-up examinations explained much of the change in CHD death rates. Results of the Seven Countries Study were crucial to the concept of population causes, that is, the mass phenomena involved in the genesis of coronary heart disease, and which influence widespread individual and species susceptibility. Where environments are unfavourable one finds maximal exhibition of coronary risk and a heavy population disease burden. Where favourable, individual (genetic) susceptibility is attenuated. This concept developed from the Seven Countries study design that combined, for the first time, a population and an individual approach. The study was realised trough effective collaboration established among clinicians, epidemiologists and nutritionists from Europe, the U.S.A., and Japan.