Body composition changes after bariatric surgery in adults with obesity and hepatic steatosis

doi:10.4240/wjgs.v18.i7.118280

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World Journal of Gastrointestinal Surgery

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1948-9366

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Retrospective Cohort Study

Copyright: ©Author(s) 2026. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial (CC BY-NC 4.0) license. No commercial re-use. See permissions. Published by Baishideng Publishing Group Inc.

World J Gastrointest Surg. Jul 27, 2026; 18(7): 118280
Published online Jul 27, 2026. doi: 10.4240/wjgs.v18.i7.118280

Table 3 Preoperative and postoperative bioelectrical impedance analysis data—continuous variables, mean ± SD

Variables	Preoperative, n = 91	Postoperative, n = 91	Δ	P value
Total body water (L)	43.47 ± 9.194	38.686 + 8.244	-4.785	0.334
Proteins	11.632 ± 2.426	10.216 + 2.17	-1.415	0.321
Minerals	3.851 ± 0.841	3.807 + 0.822	-0.043	0.851
Fat mass (kg)	59.362 ± 14.157	32.151 + 10.914	-27.211	0.09
Skeletal muscle mass (kg)	33.112 ± 7.328	28.719 + 6.457	-4.393	0.229
Body fat percentage	50.036 ± 4.117	37.392 + 7.33	-12.644	< 0.001^b
Intracellular water (L)	26.893 ± 5.509	23.7 + 4.757	-3.193	0.211
Extracellular water (L)	16.382 ± 3.629	14.922 + 3.167	-1.461	0.262
Basal metabolic rate (kcal)	1643.802 ± 268.411	1508.703 + 242.396	-135.099	0.36
Visceral fat area (cm²)	243.304 ± 29.066	152.459 + 50.785	-90.845	< 0.001^b
Body cell mass (kg)	38.56 ± 8.04	33.781 + 7.021	-4.78	0.229
Whole-body phase angle	5.895 ± 0.521	4.977 + 0.543	-0.917	0.982
Right arm phase angle	5.534 ± 0.571	4.7 + 0.571	-0.834	0.756
Left arm phase angle	5.384 ± 0.588	4.51 + 0.532	-0.873	0.507
Trunk phase angle	7.768 ± 1.211	6.586 + 1.279	-1.182	0.463
Right leg phase angle	6.254 ± 0.579	5.264 + 0.64	-0.99	0.813
Left leg phase angle	6.178 ± 0.625	5.203 + 0.68	-0.975	0.939

^bP < 0.01.

Paired Student’s t-test. BMR: Basal metabolic rate; LL: Lower limb; PA: Phase angle; SMM: Skeletal muscle mass; UA: Upper limb.

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Citation: Schmitt LKT, Ferreira LF, Mottin CC, Lacerda BG, Zubiaurre PR, Teixeira JM, Marroni CA, Fernandes SA. Body composition changes after bariatric surgery in adults with obesity and hepatic steatosis. World J Gastrointest Surg 2026; 18(7): 118280
URL: https://www.wjgnet.com/1948-9366/full/v18/i7/118280.htm
DOI: https://dx.doi.org/10.4240/wjgs.v18.i7.118280

Schmitt LKT, Ferreira LF, Mottin CC, Lacerda BG, Zubiaurre PR, Teixeira JM, Marroni CA, Fernandes SA. Body composition changes after bariatric surgery in adults with obesity and hepatic steatosis. World J Gastrointest Surg 2026; 18(7): 118280 [DOI: 10.4240/wjgs.v18.i7.118280]

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