How Gastric Sleeve Bariatric Surgery Can Lower Your Long-Term Risk of Chronic Kidney Disease

Based on the article: https://www.medscape.com/viewarticle/bariatric-surgery-may-lower-long-term-ckd-risk-2025a1000ob8?form=fpf

Introduction

At Grand Health Partners, our mission is to offer evidence-based guidance and support for individuals considering bariatric surgery as a life-changing path toward improved health. A groundbreaking new study from Denmark, published in BMC Nephrology and reported by Medscape, demonstrates that bariatric surgery, including both gastric sleeve surgery and Roux-en-Y gastric bypass, may reduce long-term risk of chronic kidney disease (CKD) and kidney failure with replacement therapy (KFRT), while showing manageable short-term kidney-related risks.

This article unpacks those findings, with special attention to the benefits and considerations surrounding gastric sleeve surgery (SG), and how this weight-loss surgery can help protect kidney health across the years.

Understanding the Study: Bariatric Surgery and Long-Term Kidney Outcomes

Study Design and Population

Researchers in Denmark analyzed national registry data covering adult patients who underwent either Roux-en-Y gastric bypass (RYGB) or sleeve gastrectomy (SG) between 2006 and 2018. Medscape
The surgical cohort included 18,827 patients (17,200 RYGB; 1,627 SG) matched 1:5 by age and sex to 94,135 patients with overweight/obesity who did not undergo surgery. A parallel comparison was made to a general population cohort matched on age and sex. Medsca pe
The median age was 41 years, 76% were women, and the median follow-up was about 8.1 years. Baseline estimated glomerular filtration rate (eGFR) and A1c (glycated hemoglobin) were similar across surgical and control groups. Medscape

What Kidney Outcomes Were Assessed?

The researchers tracked:

Acute Kidney Injury (AKI) – risk within one year after surgery
Nephrolithiasis (kidney stones) – risk at 10 years
Chronic Kidney Disease stages G3–G5 (CKD) – 10-year risk
Kidney Failure with Replacement Therapy (KFRT) – requiring dialysis or transplant, at 10 years Medscape

Key Findings: Risks and Benefits

Within 1 year, bariatric surgery patients had a 2.7% risk of AKI, with hazard ratio (HR) of 1.63 compared to non-surgical controls. Medscape
Over 10 years, there was a 3.5% risk of nephrolithiasis, with HR of 1.73 for stones compared to controls. Medscape
Importantly, the 10-year risk of CKD (G3–G5) was only 0.4%, with HR of 0.41—a 59% lower risk compared to matched controls.
The 10-year risk of KFRT was 0.2%, with HR of 0.63, equating to a 37% reduction in risk. Medscape

These results held true whether surgery patients were compared to the overweight/obesity cohort or the general age- and sex-matched population, reinforcing the protective, long-term kidney effects of bariatric surgery. Medscape

When analyzed by procedure:

AKI risk was 2.7% after RYGB, 2.4% after SG, compared to 2.5% in the obesity cohort and 1.1% in the general population. Medscape
Nephrolithiasis at 10 years was 3.6% after RYGB, but only 1.2% after SG, again compared to 2.4% (obesity cohort) and 1.3% (population). Medscape
KFRT risk at 10 years was 0.2% for RYGB, 1.6% for SG, vs 0.4% in the obesity cohort and 0.1% in the general population. Medscape

These results highlight that gastric sleeve surgery (SG) may carry somewhat lower short-term complication risks like nephrolithiasis, while still offering significant long-term reductions in CKD risk.

Why Does Gastric Sleeve Surgery Protect Against CKD?

Obesity, Diabetes, Hypertension, and Kidney Health

Obesity is a major driver of CKD, particularly when combined with conditions like type 2 diabetes and high blood pressure. Medscape+2PMC+2

Weight-loss surgery—whether RYGB or SG—consistently improves these metabolic risk factors, which in turn preserve kidney function(s) over time. Improved glycemic control, blood pressure reduction, and lipid profile improvements are mechanisms by which bariatric surgery lowers CKD progression risk. PMC+3Medscape+3PMC+3

Differences Between RYGB and Sleeve Gastrectomy

RYGB can increase risk of kidney stones due to changes in fat absorption that increase oxalate excretion. Medscape
SG has lower risk of nephrolithiasis compared to RYGB, as shown in this study (1.2% vs 3.6% at 10 years). Medscape
Overall, both procedures offer robust long-term kidney protection, but SG may offer a more favorable risk profile in some cases.

What This Means for Patients Considering Gastric Sleeve Surgery

Long-Term Kidney Protection
Patients undergoing gastric sleeve surgery can expect significantly reduced long-term risk of CKD (G3–G5) and need for dialysis or kidney transplant (KFRT).
Short-Term Risks Are Manageable
There is a small, increased short-term risk of acute kidney injury (around 2.4%–2.7%) and kidney stones, especially with RYGB. But these risks are outweighed by long-term benefits, particularly with SG.
SG May Be a Kidney-Friendly Option
Sleeve gastrectomy is often better tolerated and carries fewer kidney stone risks, making it a strong choice for patients with concerns about kidney health.
Shared Decision-Making
At Grand Health Partners, we emphasize multidisciplinary care: surgeons, nephrologists, endocrinologists, dietitians, and primary care providers collaborating to manage risks, support recovery, and monitor kidney outcomes.
Lifestyle and Follow-Up Are Essential
Post-surgery care includes:
- Maintaining hydration to reduce stone risk
- Monitoring calcium and oxalate intake
- Supplementing with calcium citrate when needed
- Regular kidney function testing (eGFR, A1c, blood pressure, etc.)

Supporting Evidence from Other Research

This Danish population-based study aligns with earlier work:

Chang et al. (2016) found bariatric surgery in severely obese patients reduced kidney function decline and lowered CKD risk. Kidney International
Friedman et al. (2018) reported sustained reduction in CKD risk over 7 years following weight-loss surgery. PMC
Kassam et al. (2020) showed patients with eGFR <90 benefited from bariatric surgery with significantly lower risk of creatinine doubling. ScienceDirect
Kukla et al. (2024) highlighted that bariatric surgery is safe and effective even in patients with advanced CKD (stages 4–5). Mayo Clinic Proceedings

These findings build a consistent body of evidence supporting gastric sleeve and other forms of metabolic surgery as kidney-protective interventions in obese patients.

Conclusion

At Grand Health Partners, we strongly believe in guiding patients toward the best choices for long-term health. The latest evidence shows that gastric sleeve surgery, a widely performed form of bariatric surgery, offers substantial long-term protection against chronic kidney disease and kidney failure. While short-term risks like AKI and nephrolithiasis—particularly with RYGB—exist, proper perioperative management and post-surgical care mitigate those risks.

For people struggling with obesity, gastric sleeve (SG) delivers not just dramatic weight loss but also improvements in diabetes, blood pressure, and overall metabolism—all translating into healthier kidneys. Being well-informed, partnering with an experienced surgical and medical team, and committing to follow-up care are key to maximizing benefits and safeguarding kidney function.

If you’re considering bariatric surgery and concerned about kidney health or CKD risk, reach out to Grand Health Partners. Our specialists provide personalized evaluations, discuss which surgery fits your needs, and support your journey to a healthier, longer life.

References

Medscape, “Bariatric Surgery May Lower Long-Term CKD Risk,” John Schieszer, September 2025. Medscape
Chang AR et al., “Bariatric surgery is associated with improvement in kidney function in severely obese patients,” Kidney International, 2016. Kidney International
Friedman AN et al., “Effect of bariatric surgery on CKD risk,” PMC, 2018. PMC
Kassam AF et al., “Long-term outcomes in patients with obesity and renal function decline,” ScienceDirect, 2020. ScienceDirect
Kukla A et al., “Management of patients with kidney disease undergoing bariatric surgery,” Mayo Clinic Proceedings, 2024. Mayo Clinic Proceedings

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