Oxidative stress, occurring whenever the production of reactive oxygen species exceeds the ability of the organism’s defense system to disarm them, and manifested, amongst all, by increased LPO and decreased activity of SOD, catalase, and GPx, has been proven to underlie memory impairments and cognitive dysfunction and to be a characteristic feature of neurodegeneration and AD [85,86,87,88]. This evidence concerns the gene CAT and memory impairment.