Health tracking data on a screen
Signals over numbers
The biohacking instinct is to measure everything, but more data is not better data. The metrics worth tracking are the ones that reliably reflect how your energy systems are actually doing, and that you will act on.
Two of the most useful require no gadget at all: your subjective energy through the day, logged honestly, and how consistently you fall asleep and wake. These humble signals often beat expensive wearables.
The wearable metrics that hold up
Among device-derived numbers, resting heart rate and heart rate variability are the two with the most signal. A drifting resting heart rate and a falling HRV are among the earliest indicators that your system is under-recovered.
Sleep duration and consistency, which most wearables estimate reasonably well, round out the short list of numbers that actually predict how you will feel.
The noise to ignore
Much of what wearables report is precision theater: sleep-stage breakdowns that are largely guesses, single-day readings that fluctuate randomly, and dashboards engineered for engagement rather than insight.
Track a few things, track them over weeks not days, and change one variable at a time. That last rule is what separates an experiment from a superstition.
Related reading
This article is for educational purposes and is not medical advice. Statements have not been evaluated by the Food and Drug Administration. Consult a healthcare professional before starting any supplement, especially alongside prescription medication.