A liquid diet is usually one in which the food is in a liquid state, or can be melted into a liquid composition in the mouth. A liquid diet is usually the most easily absorbed and digested food that is not toxic or irritating to the body, and is suitable for patients who are particularly depleted, unable to eat on their own initiative, or seriously ill. Usually, liquid diet includes the following categories, such as rice or egg soup, meat soup, date soup are all liquid diet. In addition, lotus root powder, milk powder, and noodle soup also belong to the liquid diet category. This type of liquid diet can be presented as non-scum food and can be quickly absorbed and digested by the patient. The fluid diet should also take into account the nutritional balance of the patient, such as adding some vegetable juice and fruit juice to supplement the vitamins and trace elements in the body.