Acute gastroenteritis is an acute inflammation of the gastric and intestinal mucosa, which can manifest as nausea, vomiting, and diarrhea. On the first day of the illness, it is necessary to abstain from food and drink, as any stimulation from food or water can aggravate the inflammation of the gastrointestinal tract and increase the burden on the intestines. Therefore, at the onset of the illness, it is crucial to abstain from food and drink and to actively treat with medication, such as anti-diarrheal agents and antibiotics. As the condition progresses and treatment continues, it is appropriate to gradually reintroduce food, starting with easily digestible foods such as rice porridge, millet porridge, vegetable soup, and rice soup. It is still advisable to avoid hard, raw, cold, and spicy foods.