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Dietary prevention of coronary heart disease: the Finnish Mental Hospital Study
Insights
A serum-cholesterol-lowering (SCL) diet significantly reduced coronary heart disease (CHD) incidence by about half in a controlled trial. This SCL diet demonstrated a substantial preventive effect on CHD development.
Area of Science:
- Cardiology
- Preventive Medicine
- Nutritional Science
Background:
- Coronary heart disease (CHD) poses a significant public health challenge.
- Dietary interventions are explored for their potential to mitigate cardiovascular risk factors.
- Serum cholesterol levels are a key indicator of cardiovascular health.
Purpose of the Study:
- To test the hypothesis that a serum-cholesterol-lowering (SCL) diet can decrease the incidence of coronary heart disease (CHD).
- To evaluate the preventive effect of a specific dietary regimen on cardiovascular events in a controlled setting.
Main Methods:
- A controlled intervention trial was conducted in two mental hospitals near Helsinki from 1959 to 1971.
- The study involved hospitalized middle-aged men, with a crossover design where diet interventions were switched after six years.
- One hospital received an SCL diet (low saturated fat/cholesterol, high polyunsaturated fat), while the other had a normal hospital diet, serving as a control.
Main Results:
- The SCL diet was associated with markedly lowered serum cholesterol values.
- The incidence of CHD, measured by electrocardiographic patterns and coronary deaths, was approximately halved during SCL diet periods compared to normal diet periods in both hospitals.
- Analysis of potential confounding variables indicated minimal impact, failing to explain the observed reduction in CHD incidence.
Conclusions:
- The use of a serum-cholesterol-lowering diet exerted a substantial preventive effect on coronary heart disease.
- Dietary modification, specifically reducing saturated fats and cholesterol while increasing polyunsaturated fats, is an effective strategy for CHD prevention.
Abstract:
A controlled intervention trial, with the purpose of testing the hypothesis that the incidence of coronary heart disease (CHD) could be decreased by the use of serum-cholesterol-lowering (SCL) diet, was carried out in 2 mental hospitals near Helsinki in 1959--71. The subjects were hospitalized middle-aged men. One of the hospitals received the SCL diet, i.e. a diet low in saturated fats and cholesterol and relatively high in polyunsaturated fats, while the other served as the control with a normal hospital diet. Six years later the diets were reversed, and the trial was continued another 6 years. The use of the SCL diet was associated with markedly lowered serum-cholesterol values. The incidence of CHD, as measured by the appearance of certain electrocardiographic patterns and by the occurrence of coronary deaths, was in both hospitals during the SCL-diet periods about half that during the normal-diet periods. An examination of a number of potential confounding variables indicated that the changes in them were small and failed to account for the considerable reduction in the incidence of CHD. It is concluded that the use of the serum-cholesterol-lowering diet exerted a substantial preventive effect on CHD.