BDNF and type 2 diabetes mellitus: Therefore, this study intends to use VBM as the main analysis method and SOD, MDA and BDNF as the main observation indexes to explore the effects of acupuncture-rehabilitation therapy on hippocampal volume of VCI patients complicated with T2DM from the perspective of imaging and serology, as well as the intervention mechanism of oxidative stress injury in peripheral blood serum.