The relationship between dietary fat and heart disease is complex. While certain fats, especially saturated and trans fats, are linked to increased heart disease risk by raising cholesterol levels, others like monounsaturated and polyunsaturated fats can help protect heart health. Sources of healthy fats include avocado, nuts, and olive oil. Replacing unhealthy fats with healthier alternatives is crucial for cardiovascular health. Balancing fat intake while focusing on overall dietary patterns is key for reducing the risk of heart disease.