Bryan Johnson· Author
Evidence shows you need ~1 day per time zone to re-entrain, and east is worse than west.
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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.
Evidence shows you need ~1 day per time zone to re-entrain, and east is worse than west.
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They actually say that um that eastbound travel is worse than westbound travel because you're um you are speeding up rather than slowing down.
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