Bryan Johnson· Author
Dehydration can shrink your brain by over 0.5%, and may be a reason you get a headache.
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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.
Dehydration can shrink your brain by over 0.5%, and may be a reason you get a headache.
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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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