If your blood pressure is low after a heart attack, focus on eating small, frequent meals and staying well hydrated. Include foods that are easily digested, such as vegetables, grains, and dal, as well as soups, coconut water, fruits, and foods that are somewhat salty (if your doctor allows). Large, greasy meals and alcohol should be avoided as they can make weakness worse. Additionally, follow your doctor's advice and take drugs exactly as directed because diet alone is insufficient following a heart condition.