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Moderate dietary fat consumption as a risk factor for ischemic heart disease in a population with a low fat intake: a case-control study in Korean men^1,2,3

¹ From the Departments of Preventive Medicine and Public Health and of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea; the Department of Epidemiology and Disease Control, Graduate School of Health Science and Management, Yonsei University, Seoul, Republic of Korea; the Department of Medicine, University of Washington, Seattle; the Department of Preventive Medicine, Catholic University College of Medicine, Seoul, Republic of Korea; and the Department of Preventive Medicine, College of Medicine, Pochon CHA University, Kyounggido, Republic of Korea.

Background: Dietary fat intake is associated with the incidence of ischemic heart disease (IHD) in Western countries. In populations in which both the average dietary fat consumption and the incidence of IHD are lower than in Western countries, the association of dietary fat intake with IHD incidence remains unknown.

Objective: We conducted a case-control study to examine the association of dietary fat with IHD incidence in Korean men.

Design: The case group consisted of 108 patients with electrocardiogram-confirmed myocardial infarction or angiographically confirmed (50% stenosis) IHD who were admitted to a university teaching hospital in Seoul, Republic of Korea. The controls were 142 age-matched patients admitted to the departments of ophthalmology and orthopedic surgery at the same hospital. Dietary fat intake was assessed by a nutritionist using a semiquantitative food-frequency questionnaire. Body mass index (BMI), cigarette use, alcohol intake, exercise, and history of disease were determined during an interview and examination.

Results: In a univariate analysis, the mean percentages of energy from total fat, saturated fatty acids, and monounsaturated fatty acids were significantly higher in the cases than in the controls. BMI, smoking, and a history of hypertension were associated with the occurrence of IHD. In multiple logistic analyses, total fat intake was a significant risk factor (odds ratio: 1.08 for 1% of energy intake; 95% CI: 1.02, 1.14) after adjustment for BMI and smoking.

Conclusion: In a population with a relatively low fat intake (19% of energy intake), a moderate increase in total fat intake may be a risk factor for IHD.

Key Words: Ischemic heart disease • dietary fat intake • Republic of Korea • men • case-control study

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