Coffee intake and coronary heart disease

Area of Science:

• Cardiovascular epidemiology
• Nutritional epidemiology
• Preventive cardiology

Background:

• Coffee consumption is widespread globally.
• Previous studies on coffee and coronary heart disease (CHD) risk have yielded inconsistent results.
• Understanding the long-term impact of coffee intake on cardiovascular health is crucial for public health recommendations.

Purpose of the Study:

• To investigate the association between coffee consumption and the risk of developing coronary heart disease (CHD) in a cohort of male medical students.
• To explore potential modifying factors such as smoking, hypertension, and diabetes in the coffee-CHD relationship.
• To examine the temporal aspects of coffee intake and its impact on CHD risk.

Main Methods:

• A prospective cohort study involving 1040 male medical students followed for 28 to 44 years.
• Data collected on coffee intake, lifestyle factors (smoking, BMI), and medical history (hypertension, diabetes, cholesterol).
• Statistical analysis using relative risks (RR) with 95% confidence intervals (CI), adjusting for multiple covariates.

Main Results:

• Drinking 5 cups of coffee per day was associated with an elevated risk of CHD (e.g., RR 2.94 at baseline, 5.52 for average intake).
• The increased risk was observed in both smokers and nonsmokers and was more pronounced for myocardial infarction.
• A significant portion of the excess risk was linked to coffee consumption prior to 1975, with a subsequent reduction in intake following hypertension diagnosis.

Conclusions:

• Coffee consumption, particularly at higher levels and before 1975, may be associated with an increased risk of coronary heart disease.
• The relationship between coffee and CHD risk may be influenced by temporal factors, coffee preparation methods, and individual health status.
• Further research is needed to clarify the complex interplay between coffee, cardiovascular health, and lifestyle factors.