What is Weight Loss after Bariatric Surgery Expressed in Percentage Total Weight Loss (%TWL)? An Updated Systematic Review

Category	Detail
Condition
Key Mechanisms	%TWL as a measure of weight loss after bariatric surgery (ensure sourced)
Target Population	Adults aged 18–65 years with BMI ≥ 40 kg/m² or ≥ 35 kg/m² with obesity-related comorbidities (ensure sourced)
Care Setting

Percentage total weight loss (%TWL) is endorsed by the Dutch Society for Metabolic and Bariatric Surgery (DSMBS) (ensure sourced)
The review includes data from 49 studies with a total of 119,277 patients after RYGB, 34,635 after SG, and 860 after OAGB (ensure sourced)
Pooled %TWL values reported: 35.9% for OAGB, 32.9% for RYGB, and 32.9% for SG within 24 months (ensure sourced)
The review focuses on weight-loss outcomes without comparing procedures across all anthropometric or metabolic measures (ensure sourced)
No formal meta-analysis was performed due to clinical and methodological heterogeneity (ensure sourced)

Follow-up assessments should be conducted at one and two years post-surgery (ensure sourced)

Studies excluded patients with baseline BMI < 35 kg/m² or age < 18 or > 65 years (ensure sourced)

Adults aged 18–65 years with obesity

Weight loss outcomes are reported in %TWL for various bariatric procedures

Utilize %TWL as a standard measure for evaluating weight loss after bariatric surgery (ensure sourced)
Ensure comprehensive preoperative assessment to confirm eligibility for surgery (ensure sourced)
Conduct regular follow-up to monitor weight loss and overall health outcomes (ensure sourced)

Clinical Scorecard: Understanding Percentage Total Weight Loss (%TWL) Following Bariatric Surgery: A Comprehensive Systematic Review