Bananas are generally not beneficial or harmful to the heart. Banana is a common fruit in life, the main benefit and role is to supplement the body with the required nutrients and substances, under normal circumstances, appropriate intake will not cause harm to the body and the heart, do not need to worry too much. Only for some heart disease patients, need to maintain the normal level of potassium and magnesium ions, to avoid arrhythmia and electrolyte imbalance and other conditions, need to supplement the right amount of potassium, magnesium and other substances. But banana potassium, magnesium content is limited, and can not be completely absorbed by the body, so can not play what effect, or suggest that we take potassium chloride extended-release tablets, potassium and magnesium menthonate tablets, magnesium sulfate and other drugs under the guidance of the doctor. Banana is just a common food, does not have the effect of treatment and health care, if you are not feeling well, or need to be treated under the guidance of a doctor.