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

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

  • By

  • Rutger Franken

  • Felix Hers

  • Redouan El Ajraoui

  • Kelly Tieken

  • Ralph de Vries

  • Dennis Souverein

  • Max Nieuwdorp

  • Victor Gerdes

  • Arnold van de Laar

  • June 12, 2026

  • 0 min

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Clinical Report: Understanding Percentage Total Weight Loss (%TWL) Following Bariatric Surgery

Overview

This systematic review updates the evidence on postoperative weight loss expressed in percentage total weight loss (%TWL) after various bariatric surgeries. It highlights the importance of %TWL as a clinically interpretable metric endorsed by the Dutch Society for Metabolic and Bariatric Surgery.

Background

Weight loss is a critical outcome following metabolic and bariatric surgery (MBS), with %TWL being a robust measure for evaluating surgical effectiveness. The increasing adoption of one anastomosis gastric bypass (OAGB) necessitates updated reviews to assess its weight loss outcomes compared to Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG). Understanding these metrics is essential for clinicians to evaluate and compare surgical interventions effectively.

Data Highlights

No numerical data available in the provided source material.

Key Findings

  • %TWL is endorsed by the Dutch Society for Metabolic and Bariatric Surgery as a primary metric for reporting outcomes after MBS.
  • The review updates the findings from a previous systematic review by Van Rijswijk et al. regarding postoperative weight loss after RYGB and SG.
  • OAGB has shown substantial weight loss outcomes, warranting its inclusion in contemporary reviews.
  • The systematic review followed PRISMA guidelines and was registered at PROSPERO.
  • Studies included in the review had a minimum cohort of 100 patients and a follow-up of at least one year.

Clinical Implications

Clinicians should consider %TWL as a key metric when evaluating the effectiveness of bariatric surgery. The findings from this review can help inform discussions with patients regarding expected outcomes based on surgical procedures.

Conclusion

The systematic review provides an updated perspective on %TWL following bariatric surgery, emphasizing its relevance in clinical practice and research.

Related Resources & Content

  1. Van Rijswijk et al., Obesity Surgery, 2021 -- Understanding Percentage Total Weight Loss (%TWL) Following Bariatric Surgery
  2. Obesity Surgery — Initial Weight Reduction Following Surgery as a Predictor of Long-Term Weight Outcomes After Roux-En-Y Gastric Bypass, Banded Roux-En-Y Gastric Bypass, and Sleeve Gastrectomy
  3. Obesity Surgery — Preoperative Weight Gain Does Not Correlate with Reduced Postoperative Weight Loss, but Is Associated with Decreased Total Weight Loss Over Three Years Following Bariatric-Metabolic Surgery
  4. Updates in Surgery — Personalizing Post-Bariatric Surgery Follow-Up: An Examination of Early Predictors for Weight Loss Success After Three Years
  5. Obesity Surgery — Long-Term Weight Loss Results Following Bariatric Surgery: A Comprehensive Review and Meta-Analysis of Outcomes at 10 Years or More Across Various Procedures, Alongside a 20-Year Follow-Up Study of Adjustable Gastric Banding at a Single Institution
  6. Reporting Weight Loss 2021: Position Statement of the Dutch Society for Metabolic and Bariatric Surgery (DSMBS)
  7. What is Weight Loss after Bariatric Surgery Expressed in Percentage Total Weight Loss (%TWL)? An Updated Systematic Review | Obesity Surgery | Springer Nature Link
  8. Long-Term Outcomes in Sleeve Gastrectomy versus Roux-en-Y Gastric Bypass: A Systematic Review and Meta-Analysis of Randomized Trials - PubMed

Original Source(s)

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

  • by Rutger Franken, Felix Hers, Redouan El Ajraoui, Kelly Tieken, Ralph de Vries, Dennis Souverein, Max Nieuwdorp, Victor Gerdes, Arnold van de Laar

  • June 12, 2026

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