You cannot lose weight by eating bananas at night. Bananas are food and do not have the effect of weight loss. Banana is a nutritious fruit, the average per 100g banana contains 93kcal calories, fat is 0.2g, carbohydrate is 22g, fiber is 1.2g, protein 1.4g. banana calories in the fruit belong to a relatively high, if you eat dinner and then eat bananas may lead to human body fat. Bananas contain high sugar content, and the glycemic index of 52, belonging to the medium, blood sugar control is not stable people, try to eat as little as possible, so as not to trigger abnormal fluctuations in blood sugar. Normal people eat a banana a day (150-200g), will not affect the weight change, if excessive consumption of bananas will lead to higher intake of calories and sugar, if you can not consume in a timely manner, it is easy to be converted into fat and accumulate in the human body.