LGMN and Alzheimer disease: Moreover, transplanting FMT‐BYHWD from BYHWD‐treated mice to germ‐free 3×Tg mice also ameliorated their cognitive deficits and AD‐like pathology, suggesting that the anti‐AD effects of BYHWD are mediated through the gut–brain axis by regulating the interplay between gut microbiota and the C/EBPβ/AEP signaling pathway.