Pour yourself a heart-healthy bowl.Credit: Getty Images. EatingWell design.Key PointsHeart disease is the leading cause of death among adults aged 45 and older in the U.S.Increasing your fiber intake may be one way to protect your heart.Dietitians and cardiologists recommend fiber-rich cereals to support heart health.If you want to reduce your risk of heart disease, cereal could be a surprisingly helpful place to start. Heart disease is the lead…