Patients with chronic kidney failure can eat mutton. Although these patients have reduced ability to excrete metabolic waste due to kidney failure, and the body's metabolic wastes are mainly due to the products of protein metabolism, in reality, patients with chronic kidney failure need to control their protein intake in their diet to avoid excessive protein intake leading to the overproduction of metabolic wastes. This would increase the excretory burden on the kidneys, and protein can also increase the excretion of urinary protein in patients. The daily protein intake for these patients should be controlled at less than 80% of that for normal people, with animal proteins making up more than 50% of this intake. Since mutton is an animal protein, patients with chronic kidney failure can eat mutton, but they should not eat too much.