APOE4

APOE4 also blocks neuronal glucose absorption, cutting off the brain's fallback fuel source alongside cholesterol. APOE4 also fails to clear cholesterol from the brain, generating lipotoxicity amplified 4× compared to normal APOE function, which drives amyloid plaque formation. APOE4 slows cholesterol delivery to neurons, causing synaptic deterioration in memory-critical brain regions. People with APOE4 are more susceptible to HSV-1 crossing the blood-brain barrier. APOE4-associated Alzheimer's symptoms typically manifest around age 60–65 because the gene's baseline cholesterol inefficiency compounds with age-related decline in cholesterol utilization over decades. The APOE4 genetic risk represents a predisposition to neurological herpes infection, not simply to plaque production. Epigenetic interventions through lifestyle, diet, and environment can suppress APOE4 so it does not become clinically active. APOE4 is carried by approximately 20% of the population and significantly elevates Alzheimer's disease risk. Alcohol is one of the most potent amplifiers of APOE4 expression and should be completely eliminated by carriers. APOE4 carriers should avoid alcohol and smoking entirely d…