It is important to pay attention to dietary modification and early feeding during acute diarrhea, not just fasting. Summer and autumn are prone to diarrhea caused by intestinal diseases, such as acute enteritis and acute bacillary dysentery. The traditional view is that when diarrhea, intestinal mucosa congestion, edema and even ulceration, should let the intestines “empty”, rest 1 to 2 days, when fasting can reduce the gastrointestinal burden. In fact, this understanding is wrong. Because people lose a lot of water and inorganic salts when they have diarrhea, fasting will lead to a lack of energy in the body, and because fasting can lead to hypoglycemia, some can even induce cardiovascular accidents and endanger life. In addition, fasting during diarrhea can also cause nutrient deficiency in the body, delaying the repair of intestinal lesions and thus reducing the absorption and utilization of nutrients, forming a vicious circle. Patients often suffer from different degrees of dehydration when they have diarrhea, so they should be encouraged to drink more light salt water, rice soup and mung bean soup to replenish the lost water and inorganic salts, maintain the acid-base balance in the body, and promote early recovery. At the same time, some nutritious and easily digestible foods such as egg batter, soy milk, thin noodles, tofu brain, etc. should be supplemented appropriately. For patients with mild or severe acute diarrhea, they should eat less and more meals in the first one or two days, and should eat more light, nutritious and easily digestible foods, and gradually transition to a normal diet after their condition has improved for several days. Special attention should be paid to eating less fatty foods during the initial feeding period until the resumption of normal diet to avoid malabsorption.