Scientists have identified a gut-produced molecule, imidazole propionate (ImP), as a potential key player in Alzheimer’s disease. Made by certain bacteria breaking down histidine, ImP can cross into the bloodstream and weaken the blood-brain barrier, allowing it to enter the brain where it accelerates hallmark damage—amyloid plaques and tau tangles. Human studies of over 1,100 cognitively healthy adults found higher ImP levels correlated with worse cognitive performance, early biomarker changes, and faster decline. Mouse models confirmed these effects, showing increased pathology when exposed to ImP. While not everyone with these bacteria develops Alzheimer’s, researchers now aim to develop treatments targeting ImP—like statins for cholesterol—to potentially reduce risk.
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