Scientists have discovered a key reason for early smell loss in Alzheimer’s disease. Immune cells in the brain mistakenly break down crucial nerve connections between the olfactory bulb (responsible for smell) and the brainstem. Neurons undergoing changes release signals that trigger microglia (immune cells) to eliminate them, disrupting the sense of smell. This discovery, backed by studies using mice, human tissue, and brain scans, offers potential for earlier detection and improved treatments for Alzheimer’s.
find the original post here https://www.sciencedaily.com/releases/2025/09/250901104643.htm
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