Replacing some high-calorie foods with cucumbers can reduce weight, but not by itself. Of course, there are some weight-loss effects, but not very big, just low calories.

The Japanese Cancer Society published a report last year that bananas can improve immunity and prevent cancer. Eating two bananas every day can effectively improve physical fitness. Besides, bananas are cheap, easy to eat and easy to carry. They are nutrients to maintain health and can really be called "magic fruits".

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 about100g) is only 87 calories, which is only about half lower than that of a white rice (150g, 220 calories).