The type of fat typically considered unhealthy is saturated fat and trans fat. Saturated fats, found in animal products like red meat and dairy, can raise cholesterol levels and increase the risk of cardiovascular diseases. Trans fats, often present in processed foods and margarine, are particularly harmful as they can lead to inflammation and are strongly associated with heart disease. Limiting these fats while focusing on healthier alternatives such as unsaturated fats (found in nuts, olive oil, and fish) is essential for maintaining optimal heart health and reducing the risk of chronic diseases.