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Preoperative Oral Carbohydrate Loading and Gastrointestinal Recovery After Bariatric Surgery in Metabolic Syndrome

Sponsor: First Affiliated Hospital of Chongqing Medical University • ClinicalTrials.gov ID: NCT07822763

Registry updated: 2026-10-15
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Description

This prospective randomized controlled trial aims to evaluate the effect of preoperative oral carbohydrate loading on postoperative gastrointestinal recovery in patients with metabolic syndrome undergoing bariatric surgery. Eligible participants will be randomly assigned to either a preoperative oral carbohydrate drink group or a standard preoperative fasting group. The primary objective of this study is to determine whether preoperative oral carbohydrate loading can facilitate early postoperative gastrointestinal recovery. Outcome measures will include the proportion of patients achieving postoperative gastrointestinal recovery, time to postoperative gastrointestinal recovery, perioperative blood glucose levels, and other postoperative recovery-related outcomes. This study aims to provide clinical evidence regarding the efficacy and safety of preoperative oral carbohydrate loading in patients with metabolic syndrome undergoing bariatric surgery.

Interventions

  • Preoperative oral carbohydrate loading (Other)
    Participants in the POC group were fasted from solid foods for ≥6 hours (≥8 hours after fatty or meat-containing meals), with clear liquids permitted until 2 hours before surgery, and consumed 400 mL of a carbohydrate-containing clear liquid 2 hours before surgery. The beverage provided 12.5 g of carbohydrates per 100 mL and contained no fiber, protein, or fat.
  • The placebo (Other)
    Participants in the placebo group were instructed to follow the same preoperative fasting regimen and to consume 400 mL of a matching non-caloric, carbohydrate-free clear liquid 2 hours before surgery. The placebo was similar to the carbohydrate-containing beverage in appearance and taste，but contained no carbohydrates, fiber, protein, or fat.

Eligibility criteria

Inclusion Criteria: 1. adults aged 18-65 years; 2. diagnosis of metabolic syndrome (≥3 of the following: elevated waist circumference, elevated triglycerides, elevated blood pressure, elevated fasting glucose, and reduced HDL-C); 3. eligibility for bariatric surgery(body mass index ≥35 kg/m² or metabolic disease with body mass index 27.5-34.9 kg/m²), with planned Roux-en-Y gastric bypass or sleeve gastrectomy; 4. provision of written informed consent and willingness to complete follow-up. Exclusion Criteria: 1. gastrointestinal motility disorders; 2. severe cardiovascular, pulmonary, hepatic, or renal dysfunction; 3. HbA1c ≥8.0%; 4. fasting plasma glucose \>10.0 mmol/L at the preoperative assessment; 5. malnutrition; 6. known allergy to carbohydrate preparations; 7. pregnancy or lactation; 8. previous bariatric or gastrointestinal surgery; 9. chronic use of medications known to substantially affect gastrointestinal motility.

Conditions

Metabolic Syndrome (MetS)

Locations

  • The First Affiliated Hospital of Chongqing Medical University（No. 1 Youyi Road, Yuzhong District, Chongqing 400016, China） — Chongqing, Chongqing Municipality, China
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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

View Official Record