First,I have not tried this diet. But my friend did. She lost some kilos for a short period of time. She is ok now and looks great.
Second, I have mentioned that this diet is VERY strict, that is why it is better to consult a doctor before using it.
Third, it is not a well-balanced diet that is why the duration of it is so short. (my friend is just continue eating, of course, healthy food, and is not gaining weight again).
Bananas are really rich in carbohydrates (that’s why they are rather nutritious) and almost deprived of cellulose (powerful stimulator of intestine activity). Nevertheless, the banana diet is widely used: for adiposity treatment, insufficiency of blood circulation, hypertonic illness, diseases of liver and biliary tracts.
Caloric content of such diet is 1335,0 kcal. Thus in your stomach gets 327,0 g carbohydrates, 22,5 g fibers and 1,5 g fats. You can drink water (mineral, without gas) and green tea without sugar.