Everything Birll measures is there because peer-reviewed research says measuring it changes outcomes. The key findings, by domain — with sources.
Dietary self-monitoring is one of the most replicated findings in behavioral health: the act of recording what you eat changes what you eat.
Log meals by photo or text; macros and timing land next to your glucose, weight and recovery.
Home readings beat the once-a-year clinic snapshot — and the act of monitoring, paired with support, lowers pressure itself.
Cuff readings trend beside your cardiovascular markers, sleep and stress load.
Two people can eat the identical meal and produce opposite glucose curves. Generic dietary rules can't see that — continuous data can.
CGM or finger-stick readings charted against your meals, sleep and training — so you learn what spikes you.
Heart-rate variability indexes how your autonomic nervous system is coping — and it responds to training, both physical and respiratory.
Nightly HRV behind your recovery score, plus guided breathwork with live biofeedback.
Regular self-weighing is consistently tied to better weight outcomes — it's the trend that matters, not any single morning.
Smart-scale trends smoothed over weeks, read against training and nutrition — never a single-day verdict.
The cycle is a monthly readout of underlying health — and its phases measurably interact with training, sleep and recovery.
Phase-aware tracking: recovery and readiness adjust to where you are in your cycle.
Daily movement is the single most powerful lever in the dataset — and the benefit curve is steepest exactly where most people are.
Steps, workouts and strain from any device, read against your own baseline — not a generic 10,000.
Population studies tell you what works on average. Your own data tells you what works for you — if it's read carefully, with honest uncertainty.
Birll surfaces your correlations — bed before 11pm → +9 recovery — labels its confidence, and never dresses correlation up as causation.
Resting heart rate, respiratory rate and temperature drift before you feel anything — the quiet early-warning layer of the body.
RHR, respiratory rate, SpO₂ and skin temperature captured nightly; deviations from your baseline get flagged in the morning.
When people can actually see their own clinical information, they understand more, remember more, and follow through more.
Labs, vitals and history in one exportable record you control — bring it to any appointment, or delete it in a tap.
SOURCES DESCRIBE FINDINGS IN THEIR STUDY POPULATIONS; INDIVIDUAL RESULTS VARY. BIRLL IS A WELLNESS PRODUCT, NOT A MEDICAL DEVICE, AND NOTHING ON THIS PAGE IS MEDICAL ADVICE — TALK TO YOUR CLINICIAN ABOUT YOUR RESULTS.