Patients with poor kidney function can eat tomatoes because they are rich in nutrients and can bring great benefits to patients through the following five aspects: first, tomatoes are rich in vitamin C, which can promote the synthesis of collagen and increase the absorption of iron, which can improve patients’ anemia; second, tomatoes contain lycopene, which can remove free radicals from the body, prevent aging and antioxidant; third, tomatoes are rich in dietary fiber, can promote intestinal peristalsis, maintain the intestinal microecology; four, tomatoes contain organic acids can well promote gastric secretion, improve the appetite of patients with chronic renal insufficiency, thereby increasing the absorption of nutrients; five, tomatoes can lower cholesterol, protect blood vessels. It can also promote the excretion of sodium ions in order to play a role in lowering blood pressure, diuresis and swelling.