Abstract
Objective:
To elucidate the mathematical relationship between changes of visceral adipose tissue (VAT) and total body fat mass (FM) during weight loss.
Design:
We hypothesized that changes of VAT mass are allometrically related to changes of FM, regardless of the type of weight-loss intervention, as defined by the differential equation dVAT/dFM=k × VAT/FM, where k is a dimensionless constant. We performed a systematic search of the published literature for studies that included measurements of VAT changes via magnetic resonance imaging (MRI) or computed tomography (CT) imaging along with measurements of FM changes by dual-energy X-ray absorptiometry, hydrodensitometry, air-displacement plethysmography or whole-body MRI or CT imaging. We then examined whether or not the data could be explained by the allometric model.
Result:
We found 37 published studies satisfying our search criteria, representing 1407 men and women of various ethnicities, degrees of adiposity and weight-loss interventions. The hypothesized allometric equation relating changes of VAT and FM accurately modeled the data for both men and women and for all methods of weight loss studied. The best-fit value for the dimensionless constant was k=1.3±0.1 and the resulting model had an R2=0.73.
Conclusion:
This is the first report to reveal an allometric relationship between changes of VAT and FM that holds for both genders as well as a wide variety of weight-loss interventions including bariatric surgery, caloric restriction with or without exercise and exercise alone. We conclude that changes of VAT are primarily determined by FM changes as well as the initial VAT to FM ratio.
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Acknowledgements
We thank Vipul Periwal for his suggestions regarding the Monte-Carlo simulations, Wei Shen for providing us with unpublished regression equations for translating single slice CT images to VAT volumes and Carson Chow, Nick Knuth and Daniel Holmes for their insightful comments on the manuscript. This work was supported in part by the Intramural Research Program of the National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases. CEH was supported by the European Union through the Network of Excellence BioSim, Contract No. LSHB-CT-2004-005137, and the Danish Ministry of Science Technology and Innovation and Novo Nordisk, CORA through the Industrial PhD Initiative.
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Appendix
Appendix
We hypothesized that the VAT and FM changes are allometrically related according to the following differential equation involving the infinitesimal changes dVAT and dFM:
However, only macroscopic changes ΔVAT and ΔFM can be measured, so we must therefore determine the expected relationship for macroscopic changes ΔVAT and ΔFM if the system is described by the allometric equation. Equation (A1) has the general solution:
Therefore, a macroscopic change of VAT is given by
Using the binomial expansion we obtain
Therefore,
ΔFM is typically small compared with FM, and for the data examined in this study ΔFM/FM=−0.2±0.08. Therefore, the sum contains terms that become progressively smaller and the first term of the sum is proportional to ∣ΔFM/FM2∣≪1. Therefore, the allometric equation is well approximated by the relationship studied in the present report:
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Hallgreen, C., Hall, K. Allometric relationship between changes of visceral fat and total fat mass. Int J Obes 32, 845–852 (2008). https://doi.org/10.1038/sj.ijo.0803783
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DOI: https://doi.org/10.1038/sj.ijo.0803783
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