Patients with chronic renal failure are advised to adopt a low-salt, low-fat, and high-quality protein diet. For those not undergoing dialysis, protein intake should be strictly controlled to 0.6 to 0.8 grams per kilogram of body weight per day. Additionally, patients with stage 3 CKD or above often experience electrolyte disorders, such as hyperkalemia, which can lead to cardiac arrest and arrhythmias. Therefore, it is important to avoid foods high in potassium, such as bananas, oranges, dates, kiwis, and tomatoes. Due to the strict protein intake, hypoproteinemia may occur, and these patients are also prone to hyperphosphatemia. It is recommended to choose foods with a low phosphorus to protein ratio, generally those with a ratio below fifteen. After starting dialysis, the same principles apply, but protein intake can be slightly increased, as some protein is lost during both hemodialysis and peritoneal dialysis. The protein intake can be adjusted to 1.0 to 1.2 grams per kilogram of body weight per day, while still controlling phosphorus and potassium intake.