Japanese scientists have found that a fully ripe banana produces a substance called TNF which has the ability to combat abnormal cells and enhance immunity against cancer.
They have pointed out that as the banana ripens it develops dark spots and or patches in the banana skin and the more patches it has the higher will be its immunity enhancement quality.
According the Japanese scientists who have carried out this research state that banana contains TNF which has anti-cancer properties. They say that the degree of anti-cancer effect corresponds to the degree of ripeness of the fruit.
In an animal experiment carried by them at the Tokyo University comparing various health benefits of different fruits, using banana, grape, apple, water melon. Pineapple, pears they have found banana with best results. Banana, produces anti-cancer substance, increases the number of white cells and has the ability to enhance the immunity of the body.