Effect of resected gastric volume on weight loss after sleeve gastrectomy: A retrospective clinical study

doi:10.4240/wjgs.v17.i12.113571

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Dec 27, 2025 (publication date) through Mar 5, 2026

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World Journal of Gastrointestinal Surgery

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1948-9366

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Baishideng Publishing Group Inc, 7041 Koll Center Parkway, Suite 160, Pleasanton, CA 94566, USA

Retrospective Study

World J Gastrointest Surg. Dec 27, 2025; 17(12): 113571
Published online Dec 27, 2025. doi: 10.4240/wjgs.v17.i12.113571

Effect of resected gastric volume on weight loss after sleeve gastrectomy: A retrospective clinical study

Bahadır Öndeş, Osman G Gökdere, Burhan H Kanat

Bahadır Öndeş, Osman G Gökdere, Burhan H Kanat, Department of General Surgery, Malatya Turgut Özal University, Malatya 44090, Türkiye

Author contributions: Öndeş B designed the study, collected the patients’ clinical data, analyzed the data, and drafted the manuscript; Gökdere OG contributed to the study design, interpretation of results, and critical revision of the manuscript; Kanat BH assisted with data collection, statistical analysis, and literature review; and all authors thoroughly reviewed and endorsed the final manuscript.

Institutional review board statement: This study was approved by the Medical Ethics Committee of Malatya Turgut Özal University, approval No. E-30785963-020-286154.

Informed consent statement: As this was a retrospective study, individual patient consent was not required. All procedures were conducted in accordance with routine preoperative clinical consents and were approved by the institutional ethics committee.

Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.

Data sharing statement: The data that support the findings of this study are available from the corresponding author upon request. Due to patient privacy and ethical restrictions, the data are not publicly available.

Corresponding author: Bahadır Öndeş, MD, Assistant Professor, Department of General Surgery, Malatya Turgut Özal University, Özalper Mahallesi Malatya Eğitim Araştırma Hastanesi, Malatya 44090, Türkiye. bahadir.ondes@ozal.edu.tr

Received: September 8, 2025
Revised: September 19, 2025
Accepted: November 4, 2025
Published online: December 27, 2025
Processing time: 110 Days and 4.5 Hours

Abstract

BACKGROUND

Obesity is a major global health concern associated with increased morbidity and mortality. Sleeve gastrectomy is an effective bariatric surgery; however, the impact of resected gastric volume (RGV) on postoperative weight loss remains controversial.

AIM

To evaluate the effect of RGV on weight loss and body mass index (BMI) changes in patients undergoing sleeve gastrectomy.

METHODS

This retrospective study included 49 patients. Preoperative and postoperative body weight and BMI (at 6 months and 12 months after surgery) were recorded. RGV was calculated using the ellipsoid formula based on the specimen’s length, width, and thickness measurements. Statistical analyses included parametric tests, repeated-measures one-way analysis of variance, Bonferroni post-hoc tests, and Pearson correlation analysis.

RESULTS

Both body weight and BMI significantly decreased over time (weight: F = 951.34, P < 0.01, η² = 0.95; BMI: F = 345.97, P < 0.01, η² = 0.88). A positive and statistically significant correlation was found between preoperative body weight and RGV (r = 0.285, P < 0.05). However, no significant associations were identified between RGV and weight or BMI at 6 months and 12 months.

CONCLUSION

RGV correlated with preoperative weight but not with postoperative outcomes, indicating that weight loss after sleeve gastrectomy is a multifactorial process and influenced by hormonal, metabolic, and lifestyle factors.

Keywords: Bariatric surgery; Gastrectomy; Weight reduction programs; Body mass index; Obesity; Morbid; Treatment outcome

Core Tip: This study investigated the effect of resected gastric volume on weight loss after sleeve gastrectomy. The findings revealed that although resected gastric volume correlated with preoperative body weight, it did not predict postoperative weight loss, supporting the concept that weight reduction after sleeve gastrectomy is influenced by multifactorial mechanisms beyond gastric volume alone.