Certain types of heart disease, such as heart defects, can't be prevented. However, you can help prevent many other types of heart disease by making the same lifestyle changes that can improve your heart disease, such as by:

* Not smoking
* Controlling conditions such as high blood pressure, high cholesterol and diabetes
* Staying physically active
* Eating healthy foods
* Maintaining a healthy weight
* Reducing and managing stress
* Practicing good hygiene

Link:
http://www.mayoclinic.com/health/heart-disease/DS01120/METHOD=print