Pilot testing of a portion-controlled, commercially available diet on presurgical weight loss and metabolic outcomes in patients undergoing bariatric surgery.
Study Goal
The researchers aimed to compare the efficacy of a structured, low-glycemic portion-controlled diet (PCD) intervention versus usual dietary care (UDC) for weight loss prior to bariatric surgery.
Results Summary
Both groups showed significant BMI reductions, but there were no differences between the diets and no effect on percent body fat or metabolic outcomes. Weight losses were minimal, possibly due to low adherence or motivation ahead of surgery.
Population
73 subjects preparing for bariatric surgery.
Effective Dosage
Not specified
Duration
12 weeks
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
structured, low-glycemic portion-controlled diet (PCD) intervention | no change | BMI reductions | 73 subjects | - | no differences based upon diet | #1 |
structured, low-glycemic portion-controlled diet (PCD) intervention | no change | percent body fat | 73 subjects | - | no effect | #2 |
structured, low-glycemic portion-controlled diet (PCD) intervention | no change | metabolic outcomes | 73 subjects | - | no effect | #3 |
usual dietary care (UDC) | no change | BMI reductions | 73 subjects | - | no differences based upon diet | #4 |
usual dietary care (UDC) | no change | percent body fat | 73 subjects | - | no effect | #5 |
usual dietary care (UDC) | no change | metabolic outcomes | 73 subjects | - | no effect | #6 |
dietary intervention | decrease | BMI | patients | minimal | able to reduce | #7 |
Weight loss prior to bariatric surgery is often recommended, but success with weight loss varies. The current study piloted the efficacy of a structured, low-glycemic portion-controlled diet (PCD) intervention compared to usual dietary care (UDC). The study randomized 73 subjects in a 12-week, controlled, randomized design. Participants' height, weight, BMI, percent body fat, fasting lipids, and glucose were measured at baseline and after 12 weeks. Although both groups had significant BMI reductions, there were no differences based upon diet and no effect on percent body fat or metabolic outcomes (all p values >0.10). Although patients were able to reduce their BMI through dietary intervention, losses were minimal. Both groups may have been less adherent or motivated to adopt dietary recommendations because of their upcoming bariatric surgery.