Bryan Johnson dropped some data on how international travel wrecks your biomarkers. He measured himself flying to China, India, and Australia—turns out long-haul flights and jet lag hit harder than most people think at the cellular level.

Not telling you to stop traveling, but if you're tracking sleep quality, HRV, or inflammation markers, expect them to tank for days after crossing multiple time zones. Circadian disruption isn't just feeling tired—it's measurable metabolic chaos.

Useful if you're optimizing health metrics or planning work around travel recovery windows.