You can eat tomatoes in early chronic renal failure with normal blood potassium. Tomatoes are nutritious and beneficial to the human body, they can increase appetite and quench thirst, and the lycopene contained in tomatoes has a good anti-atherosclerosis and antioxidant effect. It can reduce the risk of cardiovascular events in the early stages of chronic renal failure, so tomatoes can be eaten in chronic renal failure. However, if raw tomatoes have an effect on the concentration of stomach acid, try not to eat raw tomatoes. If the chronic renal failure is advanced, there is abnormal blood potassium or a small amount of it. In this case, try to eat less tomatoes, because tomatoes are rich in potassium, if too much consumption can cause or lead to severe hyperkalemia, which can cause arrhythmias, cardiac arrest and endanger life. This condition should generally be eaten as little as possible.