Emerging research suggests that ketogenic diets, which are very low in carbohydrates and high in fats, may help slow the progression of chronic kidney disease (CKD) by improving blood sugar control, reducing blood pressure, and promoting weight loss. While traditional kidney disease management has focused on restricting protein and specific minerals, some kidney specialists now propose that ketogenic approaches could address the underlying metabolic causes of kidney damage, particularly in people with diabetes or high blood pressure .

What Does the Research Say About Ketogenic Diets and Kidney Health?

The evidence supporting ketogenic diets for kidney disease comes primarily from studies in people with type 2 diabetes, a leading cause of kidney damage. In a two-year study of more than 200 adults with type 2 diabetes who followed a continuous remote care intervention designed to promote nutritional ketosis, participants showed greater improvements in blood pressure, blood glucose, and weight compared to those eating a standard diet . Five years later, researchers published follow-up findings showing that participants who maintained nutritional ketosis experienced increases in estimated glomerular filtration rate (eGFR), a key measure of kidney function, with over half of those in stage 3 CKD improving to stage 2 and none progressing to a worse stage .

Another research team analyzed real-world clinical data from 143 patients with normal kidney function or mild CKD who followed a very-low-carbohydrate diet for an average of 30 months. These patients experienced an increase in eGFR and decreases in creatinine and urinary albumin-to-creatinine ratio, markers that indicate kidney damage .

One of the most promising areas of research involves autosomal dominant polycystic kidney disease (ADPKD), a genetic disorder in which fluid-filled cysts form in the kidneys and gradually reduce function. In a three-month randomized trial, 131 patients with ADPKD completed a ketogenic intervention, following either a continuous ketogenic diet or a three-day-per-month water-fasting regimen. Both approaches were feasible and safe, resulting in improvements in body weight, blood pressure, and kidney function markers .

In a larger study of 103 adults with ADPKD participating in a 12-week remote, dietitian-led program called Ren.Nu, eGFR increased by 6.3% on average, along with a 4.5% reduction in body mass index (BMI). Among those taking blood pressure medications, 50% were able to reduce or discontinue use, and more than half of participants reporting kidney pain experienced improvement .

Why Are Kidney Specialists Cautious About This Approach?

Despite promising findings, other researchers and health professionals caution against ketogenic diets in people with kidney disease. Their concerns center on three potential risks: the diet's potential to promote metabolic acidosis, a condition where the blood becomes too acidic; an increased risk of kidney stones; and a higher acid load, especially when the diet relies heavily on animal proteins . These concerns highlight why working with a healthcare provider is essential before making dietary changes.

The limited amount of human clinical research in this area means that long-term safety and effectiveness remain unclear. Most studies have been relatively short-term, and more research is needed to understand how ketogenic diets affect kidney health over years or decades.

How to Support Kidney Health Through Diet and Lifestyle

• Manage Blood Glucose and Insulin: Keeping blood glucose and HbA1c (a measure of average blood sugar over three months) in a healthy range is essential for reducing the progression of diabetic kidney disease, which accounts for approximately 40% of CKD cases in people with type 2 diabetes.
• Reduce Blood Pressure: Weight loss and carbohydrate reduction can help lower blood pressure, a major driver of kidney damage. Hypertension is the second leading cause of CKD after diabetes.
• Monitor Protein Intake: Ketogenic diets can be tailored to meet protein targets based on kidney function, with 0.8 to 1.0 grams per kilogram of ideal body weight considered an appropriate target for most people with mild to moderate loss of kidney function in both CKD and ADPKD.
• Limit Kidney Stressors: Some ketogenic approaches, such as the plant-focused Ren.Nu program, limit renal stressors such as oxalate, phosphate, and excess animal protein while supplementing with medical foods to maintain safety.

The Ren.Nu program provides a real-world example of how ketogenic diets can be modified for kidney health. In one study of 24 participants who completed the program's plant-focused ketogenic diet, most lost weight, improved blood pressure and blood glucose, maintained ketosis, and showed favorable changes in kidney function markers such as eGFR and serum creatinine, while reporting high adherence and satisfaction .

What Should People With Kidney Disease Know Before Trying a Ketogenic Diet?

If you have chronic kidney disease and are considering a ketogenic diet, the most important step is to consult with your nephrologist or kidney specialist and a registered dietitian before making any dietary changes. While the emerging research is encouraging, ketogenic diets are not appropriate for everyone with kidney disease, and individual factors such as your stage of CKD, other health conditions, and current medications must be considered.

The research suggests that ketogenic diets may offer benefits for specific types of kidney disease, particularly those driven by metabolic factors like diabetes and high blood pressure. However, the potential risks of metabolic acidosis, kidney stones, and increased acid load mean that any ketogenic approach should be carefully monitored by healthcare professionals. As research continues, more clarity will emerge about which patients are most likely to benefit and how to implement these diets safely .