2. If patients want to lose weight, it's best not to eat longan. Usually, they should do more outdoor activities, exercise and strengthen their physique, such as apples, pears, bananas, grapes, grapefruit and kiwifruit. These fruits with rich nutritional value can be eaten, which can supplement the body's demand for vitamins and other trace elements, and will not lead to malnutrition. Everyone can eat less at night, only vegetables, not staple food, and sticking to it for a while is very helpful to lose weight.