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Abstract
Background: Australians' demand for metabolic and bariatric surgery is increasing, yet research on when fat-free mass, weight, and resting metabolic rate stabilise post-procedure is contradictory.
Aim: To explore and describe the changes in calculated resting metabolic rate, fat-free mass, and total body weight in patients undergoing metabolic and bariatric surgery over 12-months post-procedure.
Methods: A single-site longitudinal observation study recruited metabolic and bariatric surgery patients from a private clinic between June 2020 and January 2024. Anthropometric measures and body composition (dual energy x-ray absorptiometry) were taken pre-procedure, 6-months, and 12-months post-procedure. Resting metabolic rate was calculated using the Mifflin St. Jeor equation with fat-free mass. Data were analysed in SPSS and paired t-tests were performed between time points.
Results: N = 30 participants (BMI: 41.1 ± 8.0 kg/m2, age 48.5 ± 9.6 years, 93% female) were assessed pre- and 6-months post procedure, n = 22 had additional 12-month measures. Weight changes had not stabilised by 12-months post-procedure (0–6 months: 26.26 ± 9.05 kg, p < 0.001, 6–12 months 5.59 ± 4.77 kg, p < 0.001). Fat-free mass and calculated resting metabolic rate had stabilised by 6-months (5.87 ± 3.47 kg, p < 0.001; 484.0 ± 286.0 kJ/day, p < 0.001), with no significant changes from 6 to 12 months.
Conclusion: In metabolic and bariatric surgery patients, decreases in fat-free mass and calculated resting metabolic rate stabilised by 6-months; however, weight loss continued to 12-months suggesting weight loss between 6- and 12-months is driven by a loss of fat-mass. Future research with shorter follow-up as well as the use of indirect calorimetry may enhance results. Longer-term follow-up may help in long-term management of weight and body composition.
Aim: To explore and describe the changes in calculated resting metabolic rate, fat-free mass, and total body weight in patients undergoing metabolic and bariatric surgery over 12-months post-procedure.
Methods: A single-site longitudinal observation study recruited metabolic and bariatric surgery patients from a private clinic between June 2020 and January 2024. Anthropometric measures and body composition (dual energy x-ray absorptiometry) were taken pre-procedure, 6-months, and 12-months post-procedure. Resting metabolic rate was calculated using the Mifflin St. Jeor equation with fat-free mass. Data were analysed in SPSS and paired t-tests were performed between time points.
Results: N = 30 participants (BMI: 41.1 ± 8.0 kg/m2, age 48.5 ± 9.6 years, 93% female) were assessed pre- and 6-months post procedure, n = 22 had additional 12-month measures. Weight changes had not stabilised by 12-months post-procedure (0–6 months: 26.26 ± 9.05 kg, p < 0.001, 6–12 months 5.59 ± 4.77 kg, p < 0.001). Fat-free mass and calculated resting metabolic rate had stabilised by 6-months (5.87 ± 3.47 kg, p < 0.001; 484.0 ± 286.0 kJ/day, p < 0.001), with no significant changes from 6 to 12 months.
Conclusion: In metabolic and bariatric surgery patients, decreases in fat-free mass and calculated resting metabolic rate stabilised by 6-months; however, weight loss continued to 12-months suggesting weight loss between 6- and 12-months is driven by a loss of fat-mass. Future research with shorter follow-up as well as the use of indirect calorimetry may enhance results. Longer-term follow-up may help in long-term management of weight and body composition.
| Original language | English |
|---|---|
| Article number | 80 |
| Pages (from-to) | 83-83 |
| Number of pages | 1 |
| Journal | Nutrition and Dietetics |
| Volume | 81 |
| Issue number | S1 |
| DOIs | |
| Publication status | Published - 11 Aug 2024 |
| Event | Dietitians Australian 2024 Conference - Brisbane Convention and Exhibition Centre, Brisbane, Australia Duration: 18 Aug 2024 → 20 Aug 2024 https://www.da2024.com.au/ |
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- 2 Active
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Nutrition to optimise surgical outcomes
Marshall, S. (Project Lead), Reidlinger, D. (Partner Investigator), O'Neill, H. (Partner Investigator), Isenring, E. (Partner Investigator), Van der Meij, B. (Partner Investigator), Tang, X. (Associate Investigator), Campbell, K. (Associate Investigator), Kelly, J. (Associate Investigator) & Mayr, H. (Associate Investigator)
1/01/18 → 30/06/26
Project: Research
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Research by Master of Nutrition and Dietetic Practice Students
Isenring, E. (Supervisor), Marshall, S. (Supervisor), Reidlinger, D. (Project Lead), Kelly, J. (Supervisor), Cox, G. (Supervisor), Van der Meij, B. (Supervisor), MacKenzie-Shalders, K. (Supervisor), Mayr, H. (Supervisor), Utter, J. (Associate Professor), Dahl, C. (Masters by Coursework Student), Crichton, M. (Masters by Coursework Student), O'Bryan, K. R. (Masters by Coursework Student), Norris, R. (Masters by Coursework Student), Fahey, M. (Masters by Coursework Student), Davidson, A. (Masters by Coursework Student), Naranjo, A. (Masters by Coursework Student), Mahoney, S. (Masters by Coursework Student), Eberhardt, F. (Masters by Coursework Student), Dalwood, P. (Masters by Coursework Student), Lopez, E. (Masters by Coursework Student), Hofto, S. (Masters by Coursework Student), Innerarity, C. (Masters by Coursework Student), So, D. (Masters by Coursework Student), McIntosh, A. (Masters by Coursework Student), Gadd, N. (Masters by Coursework Student), Chan, H. C. (Masters by Coursework Student), Lan, X. (Masters by Coursework Student), Fei, X. (Masters by Coursework Student), Kostjasyn, S. (Masters by Coursework Student), Adhyaru, P. (Masters by Coursework Student), Giang, J. (Masters by Coursework Student), Leung, E. L. Y. (Masters by Coursework Student), Strike, K. (Project Roles), Pearcy, J. (Masters by Coursework Student), Somani, A. (Masters by Coursework Student), Wright, C. (Masters by Coursework Student), Matthews, C. (Masters by Coursework Student), Lee, G. (Masters by Coursework Student), Tang, X. (Associate Investigator) & Eso, A. (Associate Investigator)
1/01/14 → 31/12/27
Project: Research