After the patient has passed the difficult surgery, family members can’t wait to “take tonic” for the patient. So, what is good for patients after radical lung cancer surgery to eat? In fact, after radical lung cancer surgery, especially systemic lymph node dissection, we surgeons are very afraid of family members supplementing patients with high-fat food, which will significantly increase the patient’s chest drainage and even delay the patient’s discharge from the hospital. In the near future, my partners and I will also write a scientific paper on this issue. In conclusion, for postoperative patients with lung cancer, we still recommend a less fatty and light diet, which is more conducive to patient recovery. Some time ago, I was impressed by two patients who had “celiac pleural effusion” after surgery. These two patients also followed our advice and did not eat meat with high fat content after surgery, so why did they still have this celiac pleural effusion? We made more detailed inquiries and found that one of the patients had eaten a lot of sunflower seeds after surgery and the other had a penchant for sesame paste. Now we found the “culprit” of celiac pleural fluid. As you can see, it’s not just meat with high fat content that can cause post-operative celiac pleural fluid, but also foods like sunflower seeds and sesame seeds, which contain more plant-based fatty acids, can also cause the symptoms. Postoperative celiac pleural fluid is not harmful in itself, but its color resembles “milk”, which can cause unnecessary panic to patients and their families, and secondly, the increase in the amount of chest water can delay the removal of chest tubes, resulting in a longer hospital stay. Through the experience of these two patients, we have strengthened the dietary guidance for postoperative lung cancer patients and made more detailed preaching. If the patient’s family is still unable to determine which foods are suitable for the patient to eat, there is a simple criterion to follow, namely, if the food does not leave obvious oil stains on the clothing when spilled, it can be given to the patient. It is also important to emphasize that many patients and their families are concerned about whether eating a light diet for a long time will cause malnutrition. However, it is still more in line with health requirements to avoid large amounts of high-fat foods.