Body Awareness via Biometric Self-Tracking

Pairing objective wearable/biometric data (heart rate, sleep score, biological-age tests) with deliberate subjective attention to build calibrated, intuitive knowledge of one's own physiology over time. Cited by Bryan Johnson: 'I know after doing my own health protocol for the past couple years, I'm intensely body aware... I can feel my heart rate at any second... with pretty good accuracy.'

Components:

Sleep score → next-day performance: sleep score is described as correlating strongly with next-day work quality, creativity, and cognitive capacity, with effects accumulating across multiple nights rather than depending on any single night ('When my sleep score is low, I lack agency... When it's high, I can power through anything').
Comparative self-experiments: e.g., Andrej Karpathy's own two-month test comparing four sleep trackers (Aura, Whoop, Eight Sleep, Apple) against subjective work quality and cognitive performance, used to see which readings actually predict real performance.
Biological-age tracking: measuring a pace-of-aging metric as a longevity outcome to check whether interventions are actually slowing measured aging.
Adaptive-body caveat: the body is described as highly adaptive, able to suppress major problems for a long time before a sudden cascade failure — illustrated via an inebriation study where the brain compensates and passes behavioral tests at low-to-medium intoxication despite scan-visible impairment, failing only at high intoxication. This is used to argue cognitive decline begins long before symptoms and can in principle be detected early via scans, before it's behaviorally apparent.

Apply: Pair wearable readouts with deliberate in-the-moment awareness of your subjective state, and periodically run comparative self-experiments (e.g., multiple trackers against a logged outcome) rather than trusting a single device's output at face value. Related to the self-directed-measurement rationale in Preventable Disease & the Reactive-Medicine Framing.

Из тем: Proactive Health & Self-Advocacy