Hello, it is good to drink salt water on an empty stomach. It can clean the stomach, promote defecation, protect the mouth, resist bacteria and prevent colds. Suggestion: If constipation is caused by eating fried food, you may wish to drink a glass of light salt water on an empty stomach in the morning. Traditional Chinese medicine believes that salt has the functions of clearing heat, cooling blood and detoxifying. According to Compendium of Materia Medica, salt can "harmonize viscera, promote digestion, and make people strong".