If it is nephrectomy, patients should pay attention to the gradual transition from light diet to soft diet after operation. Because bed rest is the main reason, you can consider eating less and eating more meals, and try to choose a high-quality low-protein diet, such as chicken, fish and beef. And eat less plant protein, such as beans and coarse grains, because it will increase the burden on the kidneys. Also, don't eat fried food, and limit the intake of high cholesterol foods such as animal viscera, egg yolk, crab roe and pig's trotters. And increase vegetables appropriately to prevent constipation, pay attention to rest and avoid catching a cold.