Human study · Supplements / medicine · 11 Sept 2026
Brain aging may be detected decades before symptoms appear, with links to gut health
Source: Medical Xpress
What the research found
Study (observational). UCLA Health researchers (Kanhao Zhao, senior author Arpana Church) report in eBioMedicine on nearly 1,500 adults across three groups. A Brain Aging Index from resting brain-network scans that looked older than chronological age tracked with poorer working memory and executive function and more depressive symptoms. In one group, stool profiles (fat molecules, a cholesterol-related compound, lower estetrol) associated with a higher index, pointing to immune, vascular, neuronal, and energy pathways. This is cross-sectional, not a probiotic trial. A commercial gut product for brain age is weakly evidenced. Food-first fiber is educational, not a treatment.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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