There is a big difference between one is and two kidneys. If both kidneys are in a healthy condition, after the body is damaged, it is possible to have a compensatory condition that does not lead to rapid kidney failure. While one kidney, just rely on this kidney to occur the body’s metabolic function, the excess metabolic products, such as urea nitrogen, creatinine out of the body, the burden on the kidneys will be very heavy, excessive burden on the kidneys, it is possible to lead to kidney function failure. The human body has two kidneys, one kidney is diseased, the other kidney can perform metabolic functions. It is definitely better for a person to have two kidneys than to have one kidney. It is recommended that usually, both one kidney and two kidneys should be cared for.