Research
Mixed
Bariatric surgery, particularly malabsorptive procedures, significantly increases the risk of nephrolithiasis (kidney stones) due to enteric hyperoxaluria, low urinary volume, and hypocitraturia.
If you have had bariatric surgery, especially a bypass, you are at a significantly higher risk for kidney stones. This is not just about weight; it is about how your body processes nutrients now. You must be vigilant about hydration and dietary oxalate to protect your kidneys.
GoodSupportsHIGH confidence
BS procedures comprise restrictive techniques... malabsorptive techniques... or a combination... it may bring long-term complications such as... an increased risk of nephrolithiasis... Such a risk is estimated to be around 7.6% in bariatric patients until 5 years after surgery, which represents almost a two-fold increase in risk if compared with morbidly obese patients
Why this rating
Based on a review of multiple prospective studies and meta-analyses cited in the text.
Source
Dietary Recommendations for Bariatric Patients to Prevent Kidney Stone Formation
Milene Subtil Ormanji et al. · Nutrients · 2020
DOI 10.3390/nu12051442
narrative_reviewCited 39×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Post-bariatric patients should restrict high-oxalate foods and maintain adequate calcium intake (1200-1500 mg/day) to bind intestinal oxalate and prevent enteric hyperoxaluria.Good
- Bariatric patients should maintain a fluid intake of approximately 2.5 L/day to achieve a urinary volume of 2.5 L/day, mitigating the risk of stone formation caused by low urinary volume.Good
- Bariatric patients should take calcium citrate supplements (1200-1500 mg/day) and Vitamin D (3000 IU/day) to ensure adequate absorption and prevent bone disease and kidney stones.Good
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
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