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Invited Commentary: 30-Year Perspective on the Seven Countries Study.

Henry Blackburn

American Journal of Epidemiology

|May 24, 2017

Summary

The Seven Countries Study revealed significant variations in heart disease and overall mortality rates across diverse populations. Dietary patterns were strongly linked to these health outcomes, influencing public health and nutrition science.

Keywords:

Seven Countries Study cohort studies diet-heart hypothesis ecological study

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Area of Science:

Epidemiology
Nutrition Science
Public Health

Background:

The Seven Countries Study (SCS) was the first systematic investigation into diet, risk factors, and mortality across populations with distinct traditional diets.
It examined 15 cohorts over 15 years, focusing on working men in diverse geographical regions.

Purpose of the Study:

To present and interpret the 15-year findings of the Seven Countries Study.
To discuss the study's design, conduct, results, and implications for epidemiology and public health.

Main Methods:

The study involved 15 cohorts across diverse dietary regions.
Data collected included dietary habits, cardiovascular risk factors, and mortality rates (coronary heart disease and all-cause).
Ecologic and individual associations between diet, risk factors, and disease were analyzed.

Main Results:

Observed 30-fold differences in coronary heart disease mortality and 3-fold differences in all-cause mortality between cohorts.
Demonstrated strong ecologic associations between dietary patterns, risk factors, and disease rates.
Findings have spurred decades of causal research in epidemiology and related fields.

Conclusions:

The Seven Countries Study provided foundational evidence on diet-related cardiovascular disease risks.
Its findings significantly influenced nutrition science, public health policy, and preventive strategies.
The 1986 article remains a key reference for understanding the study's impact on epidemiologic thought.