The Vitruvian Protocol

System X of XI

Urinary

Kidneys & bladder

Why it matters

Chronic kidney disease affects roughly one adult in ten and usually causes no symptoms until it is advanced. Kidney stones affect about one person in ten over a lifetime and often recur. The simplest protection against stones is also the cheapest.

The protocol

Protocol 1

Drink enough water to pass about 2–2.5 liters of pale urine a day

Grade B · Moderate evidence
How to do it
  • Spread your fluids through the day, mostly as water. For most adults that means roughly 2.5–3 liters of total fluid, more in heat or exercise.
  • Use urine color as your gauge: pale straw is the target, and dark amber means drink more.
  • If you've had a kidney stone, aim for at least 2.5 liters of urine a day. That is the guideline target for preventing recurrence.
  • If you have heart failure or advanced kidney disease, follow your clinician's fluid limits instead.
Why it works
More urine volume dilutes calcium, oxalate and uric acid below the concentration at which they crystallize, and it flushes bacteria from the bladder.
The evidence
In a 5-year randomized trial of first-time stone formers, high water intake cut recurrence from 27% to 12%1. On that basis the American Urological Association recommends at least 2.5 liters of urine a day for stone formers2. In women with recurrent urinary tract infections, an extra 1.5 liters of water a day roughly halved infections3. Graded B for the general population: a randomized trial in chronic kidney disease found that coached extra water did not slow kidney-function decline4. Hydration prevents stones, but it doesn't treat everything.

What to measure

  • eGFR≥ 60 mL/min/1.73m²From a routine creatinine blood test. Below 60 for three months defines chronic kidney disease.
  • Urine albumin-to-creatinine ratio< 30 mg/gDetects kidney damage years before eGFR falls, and is often missed. Ask for it if you have diabetes or high blood pressure.
  • Urine colorPale strawA free daily check.

Avoid

  • Regular use of NSAID painkillers (ibuprofen, naproxen) without medical guidance. They reduce blood flow to the kidneys.
  • Uncontrolled blood pressure and blood sugar, the two leading causes of kidney failure.
  • High salt intake, which raises both blood pressure and urinary calcium.

Sources

  1. Borghi L, Meschi T, Amato F, et al. Urinary volume, water and recurrences in idiopathic calcium nephrolithiasis: a 5-year randomized prospective study. J Urol. 1996;155(3):839–843. doi.org/10.1016/S0022-5347(01)66321-3
  2. Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014;192(2):316–324. doi.org/10.1016/j.juro.2014.05.006
  3. Hooton TM, Vecchio M, Iroz A, et al. Effect of increased daily water intake in premenopausal women with recurrent urinary tract infections: a randomized clinical trial. JAMA Intern Med. 2018;178(11):1509–1515. doi.org/10.1001/jamainternmed.2018.4204
  4. Clark WF, Sontrop JM, Huang SH, et al. Effect of coaching to increase water intake on kidney function decline in adults with chronic kidney disease: the CKD WIT randomized clinical trial. JAMA. 2018;319(18):1870–1879. doi.org/10.1001/jama.2018.4930

Educational content, not medical advice. These protocols summarize published evidence for healthy adults; they are not a substitute for care from a clinician who knows your history. Check with one before starting a new exercise program, changing medication, or if you are pregnant or managing a medical condition.