Banana is one of the favorite fruits for many people. Because banana can relieve the depression, so Europeans call it as a "happy fruit". It is also a good fruit to help many girls lose weight. Banana is rich in nutrition but low in calorie. It contains plenty of protein, sugar, potassium, vitamin A and C, as well as dietary fiber. As a result, it is a very good nutritious food. What's more, banana has many medical effects, which are as follows:

First, to relieve depressed emotion
Research found out that banana contains certain substance which can help the brain produce 5-HT (hydroxyl tryptamine). People who suffer from depression always lack of 5-HT in their brain. As a result, properly eating some bananas can dispel the pessimistic and irritable emotion, and increase the calm and happy feeling.

Second, to treat constipation
If the children suffer from constipation, many mothers would like to provide bananas to them. This is absolutely correct. Nutritionists say that banana contains a great amount of soluble fiber-pectin, which can promote digestion, and adjust the gastrointestinal function.

Third, to lower the blood pressure
Banana is rich in A, B, C, E and other vitamins, and it also contains sodium and is low in cholesterol. As a result, regular eating banana can effectively prevent the hardening of the arteries, lower blood cholesterol and high blood pressure. Research shows that eating two bananas a day can reduce the blood pressure by 10%.

Fourth, to relieve itching
Banana peel contains certain material which can inhibit the growth and proliferation of the fungus and bacteria. It is obviously effective to cure the skin itching caused by diseases such as athlete's foot, tinea manuum, tinea corporis and so on.

Fifth, to eliminate the wrinkle and care the skin
Because banana contains various kinds of vitamins, and is rich in sodium while low in cholesterol, so eating banana regularly will not make people gain weight, but can make the skin delicate and healthy. What's more, often rubbing the hands with banana juice can prevent the aging, decrustation, and itching of the skin.

Sixth, to treatment insomnia
Banana is also effective on insomnia or emotional stress, because the proteins in banana contain some amino acids, which have the effect of calming nerves. So eating some bananas before going to bed can play certain sedative effect.

Although banana contains high nutrition, it is not suitable for all the people. Nutritionists say that banana contains high potassium, so people with acute and chronic nephritis, renal failure, are not suitable for eating. In addition, the banana contains too much sugar, so diabetes patients must also pay more attention not to eat too much.