Some nutritional benefits of bananas include high potassium content and high fiber. They are also good sources of vitamin C, vitamin A, vitamin B6 and magnesium, according to Live Science.
A single medium banana packs in 422 milligrams of potassium, which is 12 percent of the daily recommended intake, reports Health magazine. A diet high in potassium offers a number of benefits. As potassium helps the kidneys release extra sodium in the body, it can help reduce blood pressure. Potassium is also a mineral electrolyte, which helps boost the heart.
The vitamin content in bananas can also be helpful to the body. Vitamin B6 can improve sleep and boost white blood cell production. Vitamin A content can improve vision.
Bananas are high in fiber, which helps the body feel fuller for longer. They can also help keep the body regular. Bananas contain both soluble and insoluble fiber. Soluble fiber can boost digestion. In addition, they are relatively low in acids and can help neutralize acid levels in the gut. As probiotics feed on the kinds of carbohydrates that bananas contain, bananas also help maintain a healthy level of "good" bacteria in the gut.
Although bananas are nutritious and offer a number of health benefits, eating too many can cause sleepiness and headaches. Eating a dozen or more per day can also cause extremely high mineral and vitamin levels in the body, which can lead to nerve damage, muscle weakness and irregular heartbeats.