Due to the long pathological process of Alzheimer disease(AD),this paper begins with the time-line of classical pathological events in AD and uses anomalous microglia activation as a starting point to elucidate the role of abnormal lipid metabolism in the pathological process of AD.This includes its influence on microglial pathology and its interactions with the two primary nodes of AD,namely,Amyloid-β and the microtubule-associated protein tau.Using this as a foundation,the paper briefly describes the effects of abnormal lipid metabolism caused by short-term and long-term high-fat diets on the pathological progression of AD and its potential mechanisms,aiming to provide a reference framework for the early intervention of AD.