Abstract
According to studies, there are many inconsistencies in how IGF-1 levels change after bariatric surgery compared to before surgery, as well as its effects. These discrepancies can be attributed to various factors such as age, body mass index (BMI), and duration of intervention. Therefore, the aim of this study was to evaluate the level of insulin-like growth factor-1 (IGF-1) after bariatric surgery. A systematic review and meta-analysis based on the PRISMA guidelines was conducted from inception until 2021. From 1871 articles initially selected, 24 studies with 28 treatment arms met the eligible criteria and were included. Pooled findings from the random-effects model indicated that IGF-1 levels increased significantly [weighted mean difference (WMD) = 8.84 ng/ml; 95% confidence interval (CI) 0.30–17.39; p = 0.043] after bariatric surgery compared to before surgery. No significant heterogeneity was noted among the studies (Cochran Q test, p = 0.90, I2 = 0.0%). In subgroup analysis, bariatric surgery significantly increased IGF-1 levels at age <40 years but not at age ≤40 years. Bariatric surgery is capable of increasing the IGF-1 levels compared to the period prior to surgery but with a modest clinical magnitude.
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Data are available on request due to privacy/ethical restrictions.
Change history
08 February 2022
A Correction to this paper has been published: https://doi.org/10.1038/s41366-022-01083-6
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Acknowledgements
This study is related to the project No. 1399/4235 from Student Research Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran. We also appreciate the “Student Research Committee” and “Research & Technology Chancellor” in Shahid Beheshti University of Medical Sciences for their financial support of this study.
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ML, MB, RN, and MHS contributed in conception, design, and statistical analysis. MHS, HS, EM, and SF contributed in data collection and manuscript drafting. MHS and ML supervised the study. All authors approved the final version of the manuscript.
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Sohouli, M.H., Baniasadi, M., Nabavizadeh, R. et al. Trends in insulin-like growth factor-1 levels after bariatric surgery: a systematic review and meta-analysis. Int J Obes 46, 891–900 (2022). https://doi.org/10.1038/s41366-021-01051-6
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DOI: https://doi.org/10.1038/s41366-021-01051-6