Obesity Trial, Recruiting
Who may be able to join
AI generated eligibility summary. Written by an AI model from the official source data and checked on a sample basis. It can contain mistakes, so confirm anything important against the original source. How we use AI
Who might be able to join this trial:
People who have had Roux-en-Y gastric bypass surgery:
- Adults aged 18 to 70 who have previously had a type of weight-loss surgery called Roux-en-Y gastric bypass
- People who have had at least one calcium-based kidney stone after that surgery
- People whose urine oxalate levels (a substance measured in urine) are higher than the normal range before the study begins
People who are living with obesity but have not had gastric bypass surgery:
- Adults aged 18 to 70 with a body mass index (a measure of body weight relative to height) of 30 or above
- People who have had at least one calcium-based kidney stone
- People whose urine oxalate levels are higher than the normal range before the study begins
People who are not living with obesity and have not had gastric bypass surgery:
- Adults aged 18 to 70 with a body mass index between 18.5 and 29.9
- People who have had at least one calcium-based kidney stone
Who may not be able to join:
People who have had Roux-en-Y gastric bypass surgery:
- People who have had part or all of their colon (large intestine) removed
- People who have had a type of bowel surgery called a duodenal switch
- People who have had a type of bowel surgery called ileal-jejunal bypass
- People whose kidney stones have been mainly made of uric acid, cysteine, or struvite (rather than calcium)
People who are living with or without obesity but have not had gastric bypass surgery:
- People who have had any bowel surgery
- People who have had part or all of their colon removed
- People who have been diagnosed with an inflammatory bowel disease such as Crohn's disease or Ulcerative Colitis
- People whose kidney stones have been mainly made of uric acid, cysteine, or struvite (rather than calcium)
Important: Always verify eligibility with the trial site directly before applying.
Based on publicly available eligibility criteria from ClinicalTrials.gov. Verify directly with the trial site before acting. This is not medical advice.
Contact this trial
Phone: 773-702-1000
Contact details sourced from ClinicalTrials.gov. Verify directly with the trial site before attending.
GP referral letter
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Trial details
Where this trial is recruiting
Primary endpoints
Change in 24-hour urine oxalate from baseline to after 5 days on low oxalate diet (2 days on participant managed, 3 days on clinical research center prepared diet of 50mg/day); Percent absorption of 13C2-oxalate from pre-load baseline (time 0) to 2, 4-, 6-, and 24-hour time points; Change in urine 13C2-oxalate from pre-load baseline (time 0) to 2, 4-, 6-, and 24-hour time points; Percent absorption total urine oxalate from pre-load baseline (time 0) to 2, 4-, 6-, and 24-hour time points; Percent absorption of sucralose from pre-load baseline (time 0) to 2, 4-, 6-, and 24-hour time points; Chan...
Can't join this trial?
Data last synced from ClinicalTrials.gov: 28 July 2026. Trial status can change. Always verify current status directly with the trial site before making any decision.