Diet food without sugar or carbohydrate should be vegetables, such as cucumber and wax gourd. But eating only these things will cause nutritional imbalance. It is ok to eat like this in the short term, but not in the long term. In fact, the most important thing to lose weight is to keep your mouth shut, eat less and eat more meals, and appropriately increase protein's intake. The most important thing to lose weight is to ensure good health.