Plain-English health guides where every figure is sourced to a named authority — WHO, the CDC, the American Heart Association or peer-reviewed research — and every guide states clearly what a wearable device cannot do. Free to share and republish with attribution.
What the two numbers mean, the and/or trap most people miss, why the AHA and WHO disagree on where “high” starts, and the measurement mistakes that skew readings.
Atrial fibrillation causes one in seven strokes and often has no symptoms. What a single-lead wrist ECG can flag, and what it cannot diagnose.
More than one in four over-65s falls each year and fewer than half tell a doctor. The numbers, the fixable causes, and what fall detection really does.
A pulse oximeter reading is an estimate with a margin wider than the thresholds it is judged against — and the error is documented to be larger for people with darker skin.
Most wearable health content is written to sell something. These are written to be accurate, including where the evidence is inconvenient — for example, that cuffless blood pressure devices are not validated for clinical decisions, and that fall detection does not prevent falls. If that costs us a sale but saves someone from trusting the wrong number, that is the right trade.