Patients who are dehydrated after diarrhea should eat more warm, soft, light, easily digestible liquid or semi-liquid food, such as rice porridge, millet porridge, yam porridge, soft noodles, rice soup, etc. They can also take warm fruit juice orally, and also add salty food or oral rehydration salt appropriately. Drink as much water as possible, and if necessary, give intravenous fluids, supplement glucose injection, saline, electrolytes and multivitamins to maintain water-electrolyte balance. In daily life, avoid spicy, cold, greasy and other stimulating foods, avoid strong tea, coffee, alcohol, chocolate, cola and other undesirable stimuli, eat less and more often, and avoid overeating. You should also pay attention to more exercise in daily life to enhance your physical fitness and promote recovery.