Red leaf lettuce is rich in magnesium and potassium. Therefore, red leaf lettuce is essential for maintaining a healthy heart. As per research, potassium and magnesium help keep a healthy heartbeat. A healthy heartbeat helps in easy contraction and relaxation of the heart’s muscles. The same has been backed by other research as well. However, certain heart conditions arise due to insufficient intake of Potassium and magnesium. Various studies include high blood pressure, coronary heart disease, and even heart failure in extreme cases.