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The Roseto Study: Selection Bias Versus Social Support
Samrachana Adhikari1, Olugbenga G Ogedegbe1, Orrin Devinsky2
1Public Health, New York University Grossman School of Medicine, New York, USA.
Cureus
|July 28, 2026
Summary
The Roseto study did not show lower myocardial infarction (MI) rates in Roseto, PA compared to Framingham, MA. Methodological flaws challenge the original study
Area of Science:
- Cardiovascular Health
- Epidemiology
- Dietary Science
Background:
- A 1960s study in Roseto, PA, suggested lower myocardial infarction (MI) rates despite high saturated fat intake, challenging the Diet-Heart Hypothesis.
- This landmark study proposed social factors might protect against heart disease.
- Over 50 years later, the validity of these findings and Roseto's heart health relative to the average American remained unclear.
Purpose of the Study:
- To re-evaluate the myocardial infarction (MI) mortality rates in Roseto, PA.
- To compare Roseto's MI rates with contemporaneous data from the Framingham Heart Study.
- To assess the validity of the original Roseto study's conclusions regarding diet, social support, and heart health.
Main Methods:
- Comparative analysis of myocardial infarction (MI) death rates.
- Utilized data from Roseto, PA, and its neighboring towns.
- Matched comparison with the Framingham Heart Study cohort for age and sex.
Main Results:
- No statistically significant difference in myocardial infarction (MI) death rates was found between Roseto, PA, and Framingham, MA, after controlling for age and sex.
- Methodological limitations, including sampling biases and confounding factors, were identified in the original Roseto study.
- The study could neither support nor refute the connection between social support and improved health outcomes.
Conclusions:
- The original Roseto study's findings of lower myocardial infarction (MI) rates were likely due to sampling and comparison biases, not protective social factors or diet.
- The study's conclusions regarding saturated fat and heart disease were also impacted by these biases.
- While social support is recognized for its health benefits, the Roseto study's design flaws prevent it from serving as evidence for this connection.
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