After rectal cancer surgery, lard can be eaten in small amount, which can replenish energy for the body; reasonable diet should be taken after surgery to promote body recovery. After rectal cancer surgery, body is weak and gastrointestinal digestive function is also weak, at this time, one should maintain a light diet and reduce the intake of greasy food; lard is a common edible oil, which contains fatty acid, vitamin E and many kinds of minerals, after rectal cancer surgery, one can also eat a small amount of lard to replenish the energy for the body, but overdosage is not recommended, so as not to increase the burden on the gastrointestinal tract. After rectal cancer surgery, you should follow doctor’s instruction to eat first, and after surgery, you should eat fluids and semi-fluids first, and then gradually transition to normal diet, and generally wait until your body recovers well before resuming normal diet. After surgery, one should follow the doctor’s prescription of medication, regular review, and improve and regulate the life and diet, which is beneficial to the recovery of the body. If abnormal symptoms occur, consult a doctor as soon as possible to avoid delays.