Some patients with diseases that may require surgical treatment can eat fish properly after open surgery, such as carp, cod, grass carp, black fish, these fish can be eaten. Appropriate eating fish can supplement high-quality protein, fish is rich in high-quality protein and easy to be digested and absorbed by the body, appropriate eating can supplement the essential amino acids needed by the body, so patients after open surgery can eat fish. But avoid eating fish without scales, because the fat content of such fish is relatively high, too much of such fish may cause dyslipidemia, and may also increase the burden on the gastrointestinal tract. In addition, patients after open surgery should pay attention to eating more green vegetables and fresh fruits to supplement vitamins and dietary fiber to promote healing of the incision.