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

To update the available evidence on postoperative weight loss after bariatric surgery expressed in %TWL.

Approach:
    Key Findings:
    • 49 studies were included for analysis, reporting on RYGB, SG, and OAGB.
    • Pooled %TWL values were 35.9% for OAGB, 32.9% for RYGB, and 32.9% for SG within 24 months post-surgery.
    Interpretation:

    Pooled values should be interpreted as descriptive summaries rather than formal comparative estimates.

    Limitations:
    • Substantial clinical and methodological heterogeneity between studies.
    • Registry-based studies may reflect selection bias.
    Conclusion:

    The review provides updated %TWL outcomes for bariatric surgery procedures.

    Sources:

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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