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Area of Science:

  • Cardiovascular Epidemiology
  • Nutritional Science
  • Public Health

Background:

  • The Seven Countries Study (SCS) was a pioneering international investigation into coronary heart disease (CHD) initiated in the mid-20th century.
  • It enrolled 16 cohorts of middle-aged men across eight nations, revealing significant variations in CHD incidence and mortality among different cultures.
  • Initial findings linked these differences to average serum cholesterol levels and dietary patterns, contrasting Western diets with Mediterranean and Oriental diets.

Purpose of the Study:

  • To review the enduring contributions of the Seven Countries Study to cardiovascular epidemiology.
  • To address historical criticisms and reaffirm the study's seminal role in understanding diet-related cardiovascular disease.
  • To highlight the study's foundational insights into the relationship between diet, particularly the Mediterranean diet, and CHD mortality.

Main Methods:

  • Longitudinal cohort analysis of 16 cohorts across seven countries.
  • Follow-up periods extending to 45-50 years.
  • Multivariate statistical analyses examining risk factors, competing risks, and diet patterns.

Main Results:

  • Confirmed associations between diet patterns and all-cause mortality, as well as age at death.
  • Demonstrated that major CHD risk factors were not heterogeneous across diverse populations.
  • Identified serum cholesterol as a critical determinant of CHD, distinguishing true CHD from other heart conditions.

Conclusions:

  • The SCS remains a valuable resource for cardiovascular epidemiology, offering crucial insights into diet and mortality.
  • Despite limitations, it was the first major study to establish the link between diet and CHD across populations.
  • The study's findings underscore the significance of the Mediterranean diet in cardiovascular health.