In order to maintain a healthy heart, the first thing to do is to limit unhealthy fats and cholesterol. Most importantly, limit saturated and trans fat, as this can reduce blood cholesterol and prevent coronary artery disease. A high blood cholesterol level can cause artery plaques (also called atherosclerosis), raising heart attack risks.
Some foods (such as butter or margarine) contain high saturated and trans fats. You should avoid these foods. Instead, you can try other low-fat substitutions.
If you must use fats, you should select monounsaturated fats (such as olive oil or canola oil), you can also choose polyunsaturated fats (such as nuts and seeds).