Heart disease is the leading cause of death in women in the United States. While it’s true that the majority of women still believe that breast cancer is the leading cause of death in women, the truth is that more women die of heart disease each year than die of all types of cancer combined. Preventing heart disease is easy! ♥ Exercise. Don’t smoke or if you already do smoke, quit. Eat a healthy diet and maintain a healthy weight. Put yourself first!