You can drink warm water on an empty stomach before meals, eat eggs, bread and other foods, and drink a glass of milk or eat some fruit after meals. The following conditions should be taboo when fasting: If you don't drink milk on an empty stomach, it will affect the absorption of protein. It is recommended to drink milk after meals; Drinking tea or coffee on an empty stomach can cause gastrointestinal discomfort, affect digestion and absorption function, and also cause palpitation and fatigue; When you are on an empty stomach in the morning, you should pay attention not to eat cold drinks or food, which will cause gastrointestinal discomfort, affect digestion and absorption, and induce diarrhea; Eating sugar or other gas-producing foods on an empty stomach will cause heartburn and other symptoms due to excessive gastric acid secretion, and people with stomach problems should pay more attention.