There is no such thing as the best and fastest expectorant food, food can only provide the body with the nutrients contained in the food, and does not have the effect of expectorant. 1. Phlegm is a kind of liquid secreted by the respiratory tract of the body when it is stimulated, also known as phlegm, which usually includes necrotic mucosal epithelial cells, mucus, foreign bodies, pathogenic microorganisms, etc. The food does not have any effect on the expulsion of phlegm. Food does not have any expectorant effect on phlegm. 2. Food can only provide the body with nutrients contained in food, such as spinach can provide the body with rich vitamin A and vitamin E, for the body has a certain nutritional value. If there is coughing and sputum and other symptoms of upper respiratory discomfort, it is recommended to go to the hospital as soon as possible, in accordance with the doctor’s instructions standardized treatment.