CKD Now Affects 36 Million US Adults: What the NEJM Numbers Mean for Stone Patients
About 36 million US adults live with chronic kidney disease (CKD), and its prevalence is increasingly tied to diabetes, according to study data published in The New England Journal of Medicine and reported July 31, 2026. CKD and kidney stones are different conditions, but they share risk factors, share a patient population, and often share the same dietary conversations.
Stones are episodes; CKD is a state. A kidney stone is a crystallization event in the urinary tract, while chronic kidney disease is a progressive loss of kidney function. But the overlap is real: many stone formers have or develop CKD, diabetes raises the risk of both, and the dietary guidance for each — moderate sodium, adequate hydration, careful mineral balance — points in similar directions. Understanding where they overlap helps a stone patient make smarter choices.
How CKD and Stones Are Connected
The connection is not that stones cause CKD in most cases — it is that they share upstream drivers:
- Diabetes. The NEJM data highlights diabetes as a growing driver of CKD. Diabetes also increases stone risk by changing urine composition (more uric acid, lower pH).
- High blood pressure. A major cause of CKD; also associated with metabolic changes that favor stone formation.
- Obesity and metabolic syndrome. Associated with both CKD progression and stone recurrence.
- Chronic dehydration. A stone risk factor that also stresses the kidneys over time.
None of this means a stone former is on a path to CKD. Most stone formers have normal kidney function, and most CKD patients never form stones. The point is that the dietary habits that protect one tend to protect the other.
What the Dietary Advice Has in Common
| Dietary Factor | Stone Guidance | CKD Guidance | Oxalate Angle |
|---|---|---|---|
| Sodium | Moderate — less urinary calcium | Moderate — less strain | Independent of oxalate |
| Hydration | Dilute urine, fewer stones | Individualized, not always high | Water is zero-oxalate |
| Calcium | Adequate — binds oxalate | Individualized | Dairy is low-oxalate |
| Protein | Moderate animal protein | Moderate, kidney-aware | Eggs/lean meat ~0 mg |
| Potassium | Whole-food sources | Often restricted in late CKD | Fruit/dairy mostly low |
Notice the tension in the last row. Stone guidance often encourages potassium-rich whole foods; late-stage CKD guidance may restrict potassium. This is exactly why dietary advice must be individualized — a stone patient with early CKD and one with late CKD face different potassium and protein targets. The right answer comes from bloodwork and a clinician, not a general list.
The Oxalate Question in a CKD Context
Oxalate handling changes with kidney function. Healthy kidneys filter oxalate efficiently; as kidney function declines, oxalate clearance can fall, which is one reason advanced kidney disease can be accompanied by higher circulating oxalate. For a stone former with CKD, the oxalate column becomes more important — not less. Foods that are merely "moderate" in oxalate may deserve tighter portions when kidney function is compromised.
This is a clinical judgment, not a self-diagnosis. A stone patient with diagnosed CKD should review both their oxalate intake and their potassium/protein targets with a nephrologist and dietitian. The Harvard (2024) oxalate database is a useful reference in that conversation, but it does not replace the clinician's interpretation.
What the NEJM Data Actually Says
The reported figure — about 36 million US adults with CKD — comes from study data in the New England Journal of Medicine, with prevalence increasingly tied to diabetes. The number itself is a population estimate, and definitions of CKD (based on eGFR and albuminuria thresholds) shape how many people are counted. What is robust across data sources is the trend: CKD is common, under-recognized, and growing with the diabetes epidemic.
For a kidney stone patient, the practical takeaway is not alarm — it is awareness. If you have diabetes, hypertension, or a family history of kidney disease, ask your doctor about your kidney function numbers (eGFR, creatinine) alongside your stone evaluation. Knowing where you stand makes every dietary decision — sodium, potassium, protein, oxalate — more precise.
The Bottom Line
CKD at 36 million is a population headline with a personal message for stone patients: kidney health is a spectrum, stones sit on one part of it, and the habits that protect against stones — moderate sodium, sensible protein, adequate hydration, calcium at meals, portion-aware oxalate — are the same habits that support kidney function broadly. Check your numbers, know your stage, and
The Numbers Worth Knowing
If you are a stone former who has never seen your kidney function numbers, the list is short and worth asking about: eGFR (estimated glomerular filtration rate), serum creatinine, and a spot urine check for protein. These are routine blood and urine tests, and they place you on the kidney-function spectrum. A normal eGFR means the general stone guidance applies; a reduced eGFR means some dials — especially potassium and protein — may need adjusting. The figure that matters is not the population number of 36 million; it is your own eGFR and what your clinician says it means for your diet.
let a clinician tailor the general guidance to your specific kidneys.Frequently Asked Questions
Does having kidney stones increase my risk of CKD?
Most stone formers have normal kidney function and never develop CKD. But stones and CKD share risk factors (diabetes, hypertension, obesity), and recurrent or obstructing stones can affect kidney health. It is worth knowing your eGFR.
Should CKD patients follow a low-oxalate diet?
Oxalate clearance can fall as kidney function declines, so oxalate may matter more in advanced CKD. This is a clinical decision — discuss oxalate, potassium, and protein targets with your nephrologist.
What is the most important dietary change for someone with both stones and CKD?
There is no single answer; CKD stage determines many targets. Generally, sodium moderation and individualized hydration are safe starting points, with potassium and protein guided by bloodwork.
Where does the 36 million figure come from?
Study data published in The New England Journal of Medicine (reported July 31, 2026), estimating US adult CKD prevalence with increasing ties to diabetes.
One-Sentence Summary
Stones and CKD share risk factors and dietary levers, but the right mix — especially potassium and protein — depends on your kidney function.
Talking to Your Care Team
The most useful conversation a stone patient can have about CKD is a short one: ask for your eGFR and creatinine, ask whether a 24-hour urine test is warranted, and ask how your specific kidney function should adjust your sodium, potassium, and protein targets. These are routine questions, and a nephrologist or urologist can answer them in minutes. The population number of 36 million tells you CKD is common; your own numbers tell you what your diet should actually do.
Know your numbers, then tailor the plate.