The old king has recently lost a lot of weight, more than ten pounds, a little skin and bones, people have also become yellow, rushed to the hospital to check, found that it is pancreatic cancer, need to open surgery treatment. So the question is, if a person is so thin, nutrition is definitely not good, so should we make up for it first and then operate, or should we make up for it after the operation? Nutritional support in the perioperative period can be divided into three categories (parenteral and enteral nutrition). First, some patients have malnutrition before surgery, such as some patients with pancreatic cancer, esophageal cancer or gastric cancer. Giving appropriate nutritional support before surgery is beneficial to postoperative recovery and helps to reduce complications. However, in some special cases, such as tumor rupture and obstruction, emergency surgery is needed, so it is too late for preoperative nutrition, but only postoperative, but the effect is weaker than preoperative nutrition; for serious tumors like Lao Wang, who needs early surgery, before hospitalization and surgery, you can “plug in the gap to make up for the nutrition”, but how to make up for it, it must not be wormwood, sea cucumber and aconite. The details will be broken down later.