Bananas are quite effective in losing weight because they are low in calories and rich in dietary fiber. Bananas are sweet, so people will think that the calories must be high. In fact, the calorie of a banana (net weight about 100g) is only 87 calories, which is only about half lower than that of a white rice (150g, 220 calories). However, it is best not to eat bananas at night. First, the sugar powder of bananas is high. If you just diet and lose weight without exercise, it is estimated that these sugars will be converted into fat at night; Two: In order to prevent the rebound after losing weight successfully and keep healthy, we should still eat some cereals, such as porridge, at night. Eating a small bowl of porridge will never have more calories than a banana, but for the normal metabolism of the body, the former is a normal and limited diet, and the latter will cause stress reactions in the body.