The health benefits of banana include helping with weight loss, reducing obesity, curing intestinal disorders, relieving constipation, and curing conditions like dysentery, anemia, tuberculosis, arthritis, gout, and kidney and urinary disorders.
Banana can also help with menstrual problems and burns. It is good for reducing blood pressure, protecting heart health, boosting metabolism and immunity, reducing the severity of ulcers, ensuring healthy eyes, building strong bones, and detoxifying the body.
Lower Blood Pressure
Research conducted at the Hypertension Institute, USA states that potassium plays a key role in managing healthy blood pressure levels.  As bananas are a rich source of potassium, they help to reduce blood pressure. Potassium helps in relieving the tension in arteries and veins, so blood can flow smoothly through the body and oxygenate various organs to increase their function. This can help eliminate atherosclerosis and the subsequent strokes and heart attacks that are so commonly associated with it. The fiber in bananas also scrapes excess cholesterol from the arteries and blood vessels and further reduces stress on the cardiovascular system.
According to a research conducted in 2007 at the National Heart and Lung Institute, Imperial College London, London, UK, bananas can protect children against a cough and many associated symptoms of asthma. 
A study conducted at the Department of Medicine and Radiology, State University of New York, has revealed that pectin, in bananas, is said to be a nutrient that aids in improving glucose tolerance in diabetics.  A banana provides about 3 grams of dietary fiber, which is beneficial for both type-1 and type-2 diabetics. Type-1 diabetics may have lowered blood glucose levels and type-2 may have improved blood glucose levels. 
Preserves Memory and Boosts Mood
According to a study conducted in 2015, the amino acid tryptophan and antioxidants like dopamine, in bananas, play a vital role in boosting mood and preserving memory.  Additionally, magnesium helps relax muscles and vitamin B6 helps you sleep .
Source: Organic facts