At about 110 calories per medium banana (126g), bananas provide an excellent source of vitamin B6 and a good source of potassium, fiber and vitamin C - nutrients that help promote heart health. Banana consumption may also be linked to lower risk of leukemia, colorectal and kidney cancer in preliminary studies. In fact, one study published in Nutrition and Cancer found that those who consumed bananas three or more times per week had a 72% lower risk of colorectal cancer compared to those who consumed them less than one time per week. Bananas also contain resistant starch, which may support weight loss by enhancing metabolism and curbing appetite. Children who eat just one banana a day have a 34% less chance of developing asthmatic symptoms, according to preliminary British research. In fact, bananas have nutrition benefits for every stage in your life, possibly affecting abdominal pain in children and lowering blood pressure in adults.
Information source ( Dole Nutrition Institute) : http://www.dole.com/Facts/Food-Facts
A good source of potassium and fiber that helps lowering blood pressure