I think healthy living is a good place to start. Most of the things that people are told that are good for their heart are also good for preventing stroke. But we know from clinical research that the two risk factors that have the most impact on stroke risk are smoking and high blood pressure. So smoking cessation and making sure that your blood pressure is under good control is essential. There are other things that can be modified for instance, dietary changes and exercise both can help prevent a stroke. But in general, the highest yield changes are not smoking and having blood pressure under good control.
