Your Kidneys Filter 180 Litres a Day. Here’s How to Keep Them Doing It.
By Dr. Chris Cormier, DC — The Nerve Health Institute, Lafayette, Louisiana Two organs, each about the size of your fist, and between them they handle one of the most demanding jobs in the body — quietly, continuously, without ever asking for your attention. Most people never think about their kidneys. I think that is a missed opportunity, because kidney health is one of the areas where paying attention early pays off most, and where there is a factor almost nobody checks. That factor is the one we work on every day at The Nerve Health Institute. The number that should get your attention Your kidneys filter roughly 180 litres of plasma every single day — a glomerular filtration rate of about 120 millilitres per minute, running around the clock. Then comes the part that is genuinely astonishing. Of those 180 litres, about 178.5 litres are reabsorbed — water, salts, glucose, amino acids, all carefully pulled back into circulation. What leaves as urine is roughly 1.5 litres a day. To do that, your kidneys take 20 to 25% of everything your heart pumps — about a litre of blood every minute. They are among the most metabolically demanding organs you have, and they are performing a precision sorting operation thousands of times a day, deciding what stays and what goes. Anything working that hard deserves support. And anything that works that quietly deserves checking, because it will not tell you when it starts struggling. The two tests worth asking for If you take one practical action from this article, take this one. Early kidney changes are typically silent — the kidneys have enormous reserve capacity and will carry on without symptoms long past the point where something is measurable. Two simple tests are recommended together to get the full picture: They measure different things, which is why both matter. Ask your physician for them — particularly if you have diabetes, high blood pressure, or a family history of kidney problems. A number on a page now is worth far more than a symptom later. The factor almost nobody checks Here is where our work differs from most, and it is the part I most want people to understand. Every cell in your kidneys is wired to your brain. Think of your brain as the power company and your nerves as the lines carrying the supply. Your skin cells, muscle cells, bone cells and — critically — your organs and glands all depend on that connection working properly. The nerves supplying the kidneys emerge from the lower back. The L3 nerve in particular carries supply to the kidneys and pancreas, with neighbouring levels serving the adrenal glands, spleen and descending colon. In our clinic, the primary nerve to the kidneys is one of the most common nerves we find compromised in the patients who come to see us. That is not a small observation. If the power supply to an organ is diminished, the organ is being asked to do a demanding job on reduced capacity — and nobody is checking the supply line. We assess it directly through our 88-nerve assessment, which maps function across 88 major nerve pathways. Our conditions library sets out the presentations where we see this most often. Why this one is personal My father had his first back surgery at nineteen. The problem was in the lower lumbar nerves — L3, L4, L5. He had a second surgery later. Those surgeries relieved the mechanical pressure. What was never addressed was restoring the energy flow through the nerve itself. Over the years the supply to his pancreas and kidneys stayed weak. He developed diabetes. Then kidney problems followed. He had a kidney and pancreas transplant at 59, and he died at 67. I was nineteen once with a back that would give out for two weeks at a time — the same cells, the same pattern, the same family history running back through my grandmother, who also had diabetes. I am almost 54 now. No diabetes. No kidney problems. My L3 nerve is in excellent shape. That took years of deliberate work, and it is the reason I built a clinic around assessing the nerve supply to organs rather than waiting for the organ to announce a problem. If you have a family history like mine, that history is information — not a verdict. Supporting your kidneys with the OWL Method Our framework is oxygen, water and light, supported by frequency, magnetism and nutrients. Here is how each applies to the kidneys specifically. Oxygen Oxygen is the first ingredient in every one of your roughly 30 trillion cells, and the kidneys are among the hungriest consumers you have. Given how much of your cardiac output they take, oxygen delivery is not a background detail for these organs — it is the operating condition. Breathing quality, sleep quality and circulation all feed into it. Water — and finding your right number Water is the second ingredient, and for kidneys it does two jobs: it provides the volume the filtration system works with, and it keeps what the kidneys are processing appropriately dilute. Quality matters as much as quantity, and we cover filtration and water structuring in our at-home programme. But here is the part that genuinely matters and that general health content usually skips: your right daily amount is personal. For people with diagnosed kidney disease, fluid targets are individualised and set by your nephrologist — in earlier stages the guidance is usually to drink freely, while in later stages a specific limit is prescribed and matters a great deal. So if you are under kidney care, ask your team for your number and work to that. If you are not, steady intake through the day is the straightforward approach. We ask every patient about this at intake, because getting it right for your kidneys is the whole point. Light Light energy is how the nervous system communicates — the signalling traffic running between brain and