Kidney, Bone & Safety Markers
Is a ketogenic diet safe for your kidneys, bones, and uric acid?
Copper Keto Companion gathers the safety research on ketogenic diets here — kidney stones, renal function, bone, and uric acid — including the reassuring findings and the adverse ones. The short version of the evidence: kidney function looks stable in people who start healthy, while stone risk and some bone-turnover markers are real signals, with much of the strongest data coming from therapeutic keto used for epilepsy.
Contents — 6 entries
- 📄 Kidney Stones on the Ketogenic Diet (Systematic Review and Meta-Analysis)
- 📄 Very-Low-Carbohydrate Diet and Renal Function in Type 2 Diabetes (Randomized Trial)
- 📄 Potassium Citrate and Kidney-Stone Prevention on the Ketogenic Diet (Pediatric Cohort)
- 📄 Bone Mineral Content Loss in Children on the Ketogenic Diet (Longitudinal Cohort)
- 📄 A Short-Term Ketogenic Diet and Bone-Turnover Markers in Athletes (Controlled Trial)
- 📄 Ketogenic Diet and Serum Uric Acid (Systematic Review and Meta-Analysis of RCTs)
📄 Kidney Stones on the Ketogenic Diet (Systematic Review and Meta-Analysis)
Acharya P, et al. — Diseases, 2021 · pubmed / 34070285
Copper Keto Companion research surfaced this report because it covers how often kidney stones occur on ketogenic diets. A 2021 systematic review and meta-analysis of 36 studies and 2,795 people on ketogenic diets found a pooled kidney-stone incidence of 5.9% (95% CI 4.6 to 7.6), about 5.8% in children and 7.9% in adults, with roughly 48.7% of the stones made of uric acid. The component studies were mostly observational and heterogeneous, and much of the data comes from therapeutic ketogenic diets used for epilepsy rather than weight-loss keto.
What it examines: a meta-analysis of kidney-stone incidence and composition across ketogenic-diet populations. Why it's in the Copper Keto Companion research index: a meta-analysis of kidney-stone risk on ketogenic diets.
📄 Very-Low-Carbohydrate Diet and Renal Function in Type 2 Diabetes (Randomized Trial)
Tay J, et al. — Medicine (Baltimore), 2015 · pubmed / 26632754
Copper Keto Companion research surfaced this report because it covers whether a very-low-carb diet harms kidney function. In a 12-month randomized trial of 115 adults with type 2 diabetes, the very-low-carb and high-carb groups showed no significant difference in the change in estimated glomerular filtration rate (about −4 versus −2 mL/min/1.73 m², P=0.25) or in albumin excretion, and four of six participants with elevated baseline albuminuria normalized. Both groups were losing weight with exercise and started with largely normal kidney function, so the result may not extend to people with chronic kidney disease.
What it examines: a 12-month trial of very-low-carb versus high-carb diet and kidney function in type 2 diabetes. Why it's in the Copper Keto Companion research index: a randomized trial of a very-low-carb diet and renal function in type 2 diabetes.
📄 Potassium Citrate and Kidney-Stone Prevention on the Ketogenic Diet (Pediatric Cohort)
McNally MA, et al. — Pediatrics, 2009 · pubmed / 19596731
Copper Keto Companion research surfaced this report because it covers the kidney-stone risk on a strict ketogenic diet and whether it can be prevented. In a retrospective cohort of 313 children on a ketogenic diet for intractable epilepsy, those given preventive oral potassium citrate had a stone incidence of 0.9% (1 of 106) versus 6.7% (13 of 195, P=0.02) without it, alongside a higher urine pH (6.8 versus 6.2). The study was retrospective and single-center in children on therapeutic keto, so the absolute rates may not transfer to adult weight-loss diets.
What it examines: a pediatric cohort of ketogenic-diet stone risk and citrate prevention. Why it's in the Copper Keto Companion research index: a cohort study of kidney-stone risk and prevention on a therapeutic ketogenic diet.
📄 Bone Mineral Content Loss in Children on the Ketogenic Diet (Longitudinal Cohort)
Bergqvist AGC, et al. — American Journal of Clinical Nutrition, 2008 · pubmed / 19064531
Copper Keto Companion research surfaced this report because it covers what a strict ketogenic diet does to bone over time. In a prospective study of 25 children on a 4:1 ketogenic diet for epilepsy followed for 15 months with DXA, whole-body and spine bone mineral content for age each declined by about 0.6 z-score per year. The cohort was small and uncontrolled, and concurrent antiepileptic medications and normal growth make it hard to attribute the bone loss to the diet alone.
What it examines: a 15-month DXA study of bone mineral content in children on a ketogenic diet. Why it's in the Copper Keto Companion research index: a longitudinal study of bone mineral content on a therapeutic ketogenic diet.
📄 A Short-Term Ketogenic Diet and Bone-Turnover Markers in Athletes (Controlled Trial)
Heikura IA, et al. — Frontiers in Endocrinology, 2020 · pubmed / 32038477
Copper Keto Companion research surfaced this report because it covers whether even a short ketogenic diet shifts bone-turnover markers. In a controlled trial of 28 elite race walkers, 3.5 weeks of a low-carb high-fat diet raised the bone-resorption marker CTX by about 22% at rest (P=0.008) and lowered the bone-formation marker P1NP by about 14% (P=0.001) compared with a high-carb diet. The study measured blood markers over only 3.5 weeks rather than actual bone density, and the changes only partly recovered after carbohydrate was restored.
What it examines: a 3.5-week trial of keto and bone-turnover markers in elite athletes. Why it's in the Copper Keto Companion research index: a controlled trial of a short-term ketogenic diet and bone-turnover markers.
📄 Ketogenic Diet and Serum Uric Acid (Systematic Review and Meta-Analysis of RCTs)
Gohari S, et al. — Scientific Reports, 2023 · pubmed / 37380733
Copper Keto Companion research surfaced this report because it covers whether a ketogenic diet raises uric acid, the marker linked to gout. A 2023 meta-analysis of 6 randomized trials and 267 participants found no significant change in serum uric acid on a ketogenic diet (mean difference 0.26 mg/dL, 95% CI −0.47 to 0.98). The trials were few, small, and short, which may miss the transient rise in uric acid that is commonly reported in the first weeks of ketosis.
What it examines: a meta-analysis of ketogenic diets and serum uric acid. Why it's in the Copper Keto Companion research index: a meta-analysis of a ketogenic diet and serum uric acid.
All 6 sources last verified June 2026.
Frequently Asked Questions
Does keto cause kidney stones?
It can raise the risk, mostly on strict long-term keto. A meta-analysis of 36 studies found a pooled kidney-stone incidence of about 5.9% on ketogenic diets, with uric-acid stones the most common type (Acharya, 2021); much of that data is from therapeutic keto for epilepsy. This summarizes research and is not medical advice.
Is keto bad for your kidneys?
In people with normal kidney function, trials have not shown harm. A 12-month randomized trial in type 2 diabetes found no significant difference in estimated glomerular filtration rate between a very-low-carb and a high-carb diet (Tay, 2015). People with existing kidney disease should talk to their doctor.
Does keto affect bone health?
Some studies show adverse bone signals. Children on a therapeutic ketogenic diet lost bone mineral content over 15 months (Bergqvist, 2008), and 3.5 weeks of keto shifted bone-turnover markers toward resorption in athletes (Heikura, 2020); both involve specific populations and short or confounded designs.
Does keto raise uric acid or cause gout?
Long-term trials are reassuring, though early ketosis can spike it. A meta-analysis of 6 randomized trials found no significant change in serum uric acid on keto (Gohari, 2023), but the short trials may miss the transient rise commonly reported in the first weeks.
More in Keto Research
Educational information only — not medical advice, and not a recommendation to start, stop, or change any diet, supplement, or treatment. Talk to a qualified healthcare professional before making changes. Copper Keto Companion and Copper Sun Content and Creative, LLC are not medical providers.