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Biomarker explainers, longevity research and product updates — in one feed.
VO2max is often described as a measure of the lungs. In healthy people the ceiling is set mostly by how much oxygen the heart and blood can deliver; the lungs become the limit only in particular situations. What changes with age, and how accurate lab tests, formulas and watches are.
An open mouth at night usually means breathing through the nose or throat is harder, but the sign alone does not make a diagnosis. How sleep-disordered breathing in children and teenagers is confirmed, what trials of adenotonsillectomy, medicines, nasal treatment, orthodontics and exercises found, and where evidence is still missing.
Three different things are sold as "genetic age": the inherited DNA sequence, telomere length and DNA methylation. What each one shows, how reproducible the measurement is, and what these tests do not say.
Parents of a child older than seven are told two opposite things: that it is too late, and that a new method changes everything. What the trials in this age group actually found — glasses alone, patching and atropine, binocular games, levodopa — which age ranges regulators authorised and on what data, and what these studies do not say.
"Vitamin D for the elderly", "how long can you take it", "all year round?" — these are questions about regimen, not deficiency. What changes in the body after sixty, what VITAL, D-Health, DO-HEALTH and STURDY found on fractures, falls and mortality, why large infrequent doses produced more falls in several trials — and how two guidelines read the same blood test differently.
Carotid plaque is usually found by accident, and the report comes back with a percentage, a "smooth contour" and the word "stable". Here is what in that is measured and what is interpretation: why the percentage is not a severity score, what "stability" actually stands for, why calcification is not a synonym for danger, and which treatments have changed plaque in studies rather than in advertising.
You are holding a report with a percentage on it and no idea what to do with it. What is actually measured under the name "omega-3 index", why two laboratories do not compare, where the 4% and 8% zones came from, what genuinely moves the marker — and where the evidence stops.
"Thickened left ventricular wall" in an echocardiography report causes no sensation and is almost always found while looking for something else. What sits behind the phrase, what measures it, what actually reduces myocardial mass in trials — and why "regression is accompanied by fewer events" and "regression reduces risk" are different claims.
"Does cortisol age you" is really three different questions, and the evidence behind them differs in strength. What is shown about age-related change in the rhythm, what is associated with outcomes and by what design, what the field does not have at all — and what gets sold in that gap.
Liver fat is usually an incidental finding, and what drives the prognosis is not the fat but the fibrosis stage. What changed in the name of the diagnosis, how stage is measured, what has actually been tested — and why the pharmacy shelf fails a single question about endpoints.
Fitness is among the strongest observational predictors of mortality. How large the association actually is, where the gradient is steepest, what randomised trials did not show, and why clinical-cohort numbers cannot be compared with a watch reading.
Articles in this section are educational and are not medical advice, a diagnosis, or a prescription. Consult a qualified professional before acting on anything you read here.
