Bryan Johnson· Author
Also hydrate before an MRI, as dehydration-related small decreases in brain volume can confound MRI-based assessment of brain atrophy which is a biomarker of aging.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Also hydrate before an MRI, as dehydration-related small decreases in brain volume can confound MRI-based assessment of brain atrophy which is a biomarker of aging.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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