Diet and 20-y mortality in two rural population groups of middle-aged men in Italy.

The relationships between individual diet, measured in 1965 on the two Italian rural cohorts of the Seven Countries Study on Cardiovascular Disease, and subsequent mortality from all and specific causes of death in 20 y are studied. The analysis covers 1536 men aged 45-64 y at entry to the study. By using a cluster analysis technique, individuals are aggregated into four groups so that the elements within a group have a higher degree of similarity in dietary nutrients than between groups. Impressive differences in death rates between groups are found especially at the 10- and 15-y anniversaries. The relative risk between the least and the most favored group in 15-y mortality from coronary heart disease is 4.7; in 10 y the relative risk for cancer mortality is 2.9 and for liver cirrhosis approximately 4.