We're born with two kidneys primarily because it provides a backup system. This redundancy offers protection against kidney failure or injury. Even though we can survive with only one functioning kidney, having two ensures adequate kidney function, even if one is damaged or diseased.
The Evolutionary Advantage of Redundancy
Our bodies often exhibit a design philosophy prioritizing redundancy as a safety net. As stated in an October 23, 2023, article, "Our organs have more reserve than most of us will ever need. It's as if our bodies were designed with the idea that we might need backups in case of illness or injury. And voila: when all goes well, we arrive at birth with two kidneys, not just one!" This is not unique to kidneys; we see similar redundancy in other organs.
While the exact evolutionary pressures are not fully understood, the existence of two kidneys likely improved survival rates in our ancestors, increasing the chances of overcoming illnesses or injuries affecting the renal system. A single kidney malfunction could be fatal; however, with two, one could compensate for the other's failure, improving overall survival and reproductive success.
Living with One Kidney: A Testament to Redundancy
Many individuals live perfectly healthy lives with only one kidney. This is possible because a single healthy kidney is generally capable of performing all necessary functions. Some people are born with only one kidney due to developmental issues, while others may lose one due to injury or disease. The fact that one kidney can handle the workload is further evidence of the body's inherent reserve capacity. According to La Trobe University, "It is true, you can live with only one kidney. Some people are born with only one because the other one did not grow properly."
In summary, the presence of two kidneys is a key aspect of our biological design that offers increased resilience and a safety margin against potential kidney dysfunction. It highlights the biological principle of redundancy and its importance in ensuring overall health and survival.
