There are studies that suggest almost everyone can have a healthy heart provided they modify their diet and lifestyle. This means eating nutritious, balanced meals, regular exercise, maintaining an optimal weight, quitting smoking and limiting your alcohol intake. For more information, visit your nearest cardiovascular wellness center. Many of these conduct free heart health awareness programs that you can take advantage of!
Cardiovascular Wellness: http://www.brighamandwomens.org/Departments_and_Services/medicine/services/cvcenter/cvwellness/
By keeping your cholesterol within normal limits, keeping blood pressure within normal limits, not smoking, avoiding stress, eating a healthy diet and exercising regularly, don't drink excess alcohol.
There is possibly a genetic issue which can come into play, but there is nothing that can be done about that.