Stanford Discovers Blood Immune Cells Enter the Aging Brain in Midlife: What This Means for Alzheimer’s Risk
An August 14, 2026 Stanford study found blood immune cells begin entering the aging brain in midlife in far greater numbers than previously known — carrying systemic inflammation directly into brain tissue. A 40-year pharmacist explains what this means for Alzheimer’s risk and how Americans can protect their blood-brain barrier starting today.