Severe pancreatitis should refer to severe acute pancreatitis. Patients with severe acute pancreatitis should not eat until at least 7 to 10 days after undergoing treatment, depending on the recovery of the patient’s intestinal function. Severe acute pancreatitis is acute pancreatitis with systemic as well as local complications, is a special type of acute pancreatitis, the patient after treatment, usually have to fast, which can help to reduce the symptoms of vomiting and abdominal distension, usually 7 to 10 days, the intestinal function completely recovered before resuming eating. After the patient’s intestinal function is restored, he or she can eat fluids such as porridge first, and then slowly transition to semi-liquid food such as noodles and ordinary food such as rice. Since severe acute pancreatitis is mostly caused by alcoholism and overeating, it is recommended that patients should stop drinking in their daily life, and avoid excessive intake of oily and stimulating foods such as braised meat and chili peppers in order to prevent aggravating the burden on the gastrointestinal tract. The exact time of resuming diet after fasting should follow the doctor’s advice.