Abstract
There is inconsistent evidence for an association of obesity with white matter microstructural alterations. Such inconsistent findings may be related to the cumulative effects of obesity and alcohol dependence. This study aimed to investigate the possible interactions between alcohol dependence and overweight/obesity on white matter microstructure in the human brain. A total of 60 inpatients with alcohol dependence during early abstinence (44 normal weight and 16 overweight/obese) and 65 controls (42 normal weight and 23 overweight/obese) were included. The diffusion tensor imaging (DTI) measures [fractional anisotropy (FA) and radial diffusivity (RD)] of the white matter microstructure were compared between groups. We observed significant interactive effects between alcohol dependence and overweight/obesity on DTI measures in several tracts. The DTI measures were not significantly different between the overweight/obese and normal-weight groups (although widespread trends of increased FA and decreased RD were observed) among controls. However, among the alcohol-dependent patients, the overweight/obese group had widespread reductions in FA and widespread increases in RD, most of which significantly differed from the normal-weight group; among those with overweight/obesity, the alcohol-dependent group had widespread reductions in FA and widespread increases in RD, most of which were significantly different from the control group. This study found significant interactive effects between overweight/obesity and alcohol dependence on white matter microstructure, indicating that these two controllable factors may synergistically impact white matter microstructure and disrupt structural connectivity in the human brain.
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Data availability
The data that support the findings of this study are available from the corresponding author, Wan-jun Guo, upon reasonable request.
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Acknowledgements
We thank all individuals who participated in the study.
Funding
The study was partly supported by grants from the National Natural Science Foundation (grant no. 81571305 and 82171487) to Wan-jun Guo, and the Introduction Project of Suzhou Clinical Expert Team (grant no. SZYJTD201715) to Tao Li.
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WJG, TL, HLC designed the study and wrote the protocol. HLC, WW, YJM, RHD, XJL, WD contributed to data acquisition and resources. HLC undertook the statistical analysis with some help from WW and WJG. HLC wrote the first draft of the manuscript. YSL, ZT, XDD, TL and WJG contributed to funding acquisition. WJG, AJG and MLL contributed to the revision of the manuscript. All authors contributed to and approved the final manuscript.
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Cao, HL., Wei, W., Meng, YJ. et al. Interactions between overweight/obesity and alcohol dependence impact human brain white matter microstructure: evidence from DTI. Eur Arch Psychiatry Clin Neurosci (2024). https://doi.org/10.1007/s00406-024-01760-9
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DOI: https://doi.org/10.1007/s00406-024-01760-9