The Dukan diet does not allow bananas whatsoever because they are considered to be “too sugary”, though the level of sugar in them is not as high as some other fruits.

For those who are on this diet, there are many alternatives which are provided for you, though you will not be able to indulge in bananas throughout any stage of this diet. Bananas are also fairly high in calories, though they are a good overall fruit for you to each on a regular or semi-regular basis because they contain plenty of vitamins and nutrients which are good for your body and help it to function properly.